4.5-litres capacity vest, very breathable and extremely light. The HV 4.5 adapts perfectly to the body anatomy preventing from the contents bouncing inside the pack, even in high intensity activities. Easy-opening handles for all pockets. And ideal trail running vest for all year round activities. 

FAST&LIGHT - 138g

Light high capacity trail running belt ideal for short and medium distance races or as an accesory to a vest in long distance ones. Its seamless highly stretchable fabric provides a perfect fit while carrying a mobile device, gels, bars, gloves, poles (front or back), a 500 ml soft flask and a waterproof jacket in a no-rebound compact way.

FAST&LIGHT - 61g

Light high capacity trail running belt ideal for short and medium distance races or as an accesory to a vest in long distance ones. Its seamless highly stretchable fabric provides a perfect fit while carrying a mobile device, gels, bars, gloves, poles (front or back), a 500 ml soft flask and a waterproof jacket in a no-rebound compact way.

FAST&LIGHT - 61g

Outdoor technical cap that combines the trucker style aesthetics with the functionality and lightness of the OS2O technical apparel. Built with Cool2Dry® fabric in mesh and sweatband, ultra lightweight and quick-dry, it provides a cool and ventilated feeling while the nylon on the front and brim protects from the rain and wind. Thanks to its foam in the visor and front, it is extremely packable, rebounding to its original form in seconds.

A versatile cap, ideal for any outdoor activity, including high intensity ones. 

FAST&LIGHT - 48g

Outdoor technical cap that combines the trucker style aesthetics with the functionality and lightness of the OS2O technical apparel. Built with Cool2Dry® fabric in mesh and sweatband, ultra lightweight and quick-dry, it provides a cool and ventilated feeling while the nylon on the front and brim protects from the rain and wind. Thanks to its foam in the visor and front, it is extremely packable, rebounding to its original form in seconds.

A versatile cap, ideal for any outdoor activity, including high intensity ones. 

FAST&LIGHT - 48g

Outdoor technical cap that combines the trucker style aesthetics with the functionality and lightness of the OS2O technical apparel. Built with Cool2Dry® fabric in mesh and sweatband, ultra lightweight and quick-dry, it provides a cool and ventilated feeling while the nylon on the front and brim protects from the rain and wind. Thanks to its foam in the visor and front, it is extremely packable, rebounding to its original form in seconds.

A versatile cap, ideal for any outdoor activity, including high intensity ones. 

FAST&LIGHT - 48g

Ultra light, extremely packable and very breathable trail running cap. Short flexible brim that protects your face while allowing a wide visibility and makes it packable in a pocket of a running belt. Built with Cool2Dry® very light and quick dry provides a cool and ventilated feeling while protecting from sun, wind and rain.

An ideal accessory for any trail running activity under the sun, wind or rain.

FAST&LIGHT - 42g

Ultra light, extremely packable and very breathable trail running cap. Short flexible brim that protects your face while allowing a wide visibility and makes it packable in a pocket of a running belt. Built with Cool2Dry® very light and quick dry provides a cool and ventilated feeling while protecting from sun, wind and rain.

An ideal accessory for any trail running activity under the sun, wind or rain.

FAST&LIGHT - 42g

Ultra light, extremely packable and very breathable trail running cap. Short flexible brim that protects your face while allowing a wide visibility and makes it packable in a pocket of a running belt. Built with Cool2Dry® very light and quick dry provides a cool and ventilated feeling while protecting from sun, wind and rain.

An ideal accessory for any trail running activity under the sun, wind or rain.

FAST&LIGHT - 42g

Ultra light, extremely packable and very breathable trail running cap. Short flexible brim that protects your face while allowing a wide visibility and makes it packable in a pocket of a running belt. Built with Cool2Dry® very light and quick dry provides a cool and ventilated feeling while protecting from sun, wind and rain.

An ideal accessory for any trail running activity under the sun, wind or rain.

FAST&LIGHT - 42g

Seamless compression toesocks designed to reduce muscle fatigue while preventing blisters. Its progressive compression from ankle to knee helps blood circulation and recovery. Its high nylon composition ensures high resistance. Mesh on instep to enhance breathability and arch support to provide stability. Ideal for medium or high intensity activities, or for recovery after the activity.

Thermal ultralight beanie designed for medium/high intensity outdoor activities in low temperatures. The fabric honeycomb structure with microperforations provides an excellent thermal protection, a great fitting and breathability. The perfect head accesory for winter trail running, alpinism and skimo.

FAST&LIGHT - 35 g

Thermal ultralight beanie designed for medium/high intensity outdoor activities in low temperatures. The fabric honeycomb structure with microperforations provides an excellent thermal protection, a great fitting and breathability. The perfect head accesory for winter trail running, alpinism and skimo.

FAST&LIGHT - 35 g

Thermal ultralight beanie designed for medium/high intensity outdoor activities in low temperatures. The fabric honeycomb structure with microperforations provides an excellent thermal protection, a great fitting and breathability. The perfect head accesory for winter trail running, alpinism and skimo.

FAST&LIGHT - 35 g

Thermal ultralight beanie designed for medium/high intensity outdoor activities in low temperatures. The fabric honeycomb structure with microperforations provides an excellent thermal protection, a great fitting and breathability. The perfect head accesory for winter trail running, alpinism and skimo.

FAST&LIGHT - 35 g

The Speedlite Gloves are lightweight and versatile trail running gloves. Made with a double layer fabric, the outside layer made of elastane offers a great fit while the inner  microfleece guarantees a soft touch and breathability. The result of this combination is a warm and comfortable running glove. They also feature a silicone design for an improved grip. Touch-screen compatible.

Ultralight and functional arm sleeves that offer insulation, protection and a high breathability. Made of Polypropylene Dryarn and spandex, the OS2O Arm Sleeves provide high elasticity in both directions and a quick dry function even under high humidity environments. They also have good durability and resistance from scratches. A basic item providing safety and high performance in a minimum weight.

FAST&LIGHT - 24g (S/M) 

Light and very breathable trail running visor. Built with Cool2Dry® fabric, ultralight and quick drying, it provides a cool and ventilated feeling while being protected from the sun. Semi flexible brim that allows it to be packed in a very low volume rebounding to its original position in seconds.

An ideal accessory for any trail running activity to protect your face from the sun or rain providing a proper ventilation of the head.

FAST&LIGHT - 31g

Light and very breathable trail running visor. Built with Cool2Dry® fabric, ultralight and quick drying, it provides a cool and ventilated feeling while being protected from the sun. Semi flexible brim that allows it to be packed in a very low volume rebounding to its original position in seconds.

An ideal accessory for any trail running activity to protect your face from the sun or rain providing a proper ventilation of the head.

FAST&LIGHT - 31g

Light and very breathable trail running visor. Built with Cool2Dry® fabric, ultralight and quick drying, it provides a cool and ventilated feeling while being protected from the sun. Semi flexible brim that allows it to be packed in a very low volume rebounding to its original position in seconds.

An ideal accessory for any trail running activity to protect your face from the sun or rain providing a proper ventilation of the head.

FAST&LIGHT - 31g

Light and very breathable trail running visor. Built with Cool2Dry® fabric, ultralight and quick drying, it provides a cool and ventilated feeling while being protected from the sun. Semi flexible brim that allows it to be packed in a very low volume rebounding to its original position in seconds.

An ideal accessory for any trail running activity to protect your face from the sun or rain providing a proper ventilation of the head.

FAST&LIGHT - 31g

The OS2O Wool socks are made with merino wool providing an optimum comfort and performance. Designed to provide the desired level of support and comfort in outdoor activities while avoiding blisters, keeping your feet dry and maximizing the performance of the merino wool, being ideal at low temperatures.

Seamless thong for women designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. Designed with microtensors that guarantee a perfect fit and no movements of the garment. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 16g (XS/S)

Seamless thong for women designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. Designed with microtensors that guarantee a perfect fit and no movements of the garment. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 16g (XS/S)

Seamless briefs designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex creating an ideal first layer garment in direct contact with the skin. Designed with microtensors on legs and back that guarantee a perfect fit and no movements. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 37g (S/M)

Seamless briefs designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex creating an ideal first layer garment in direct contact with the skin. Designed with microtensors on legs and back that guarantee a perfect fit and no movements. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 37g (S/M)

Seamless panties designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex, creating an ideal first layer garment in direct contact with the skin. Designed with microtensors that guarantee a perfect fit and no movements of the garment. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 28g (XS/S)

Seamless panties designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex, creating an ideal first layer garment in direct contact with the skin. Designed with microtensors that guarantee a perfect fit and no movements of the garment. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 28g (XS/S)

Seamless panties designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex, creating an ideal first layer garment in direct contact with the skin. Designed with microtensors that guarantee a perfect fit and no movements of the garment. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 28g (XS/S)

Seamless boxer designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex creating an ideal first layer garment in direct contact with the skin. Designed with microtensors on legs and back that guarantee a perfect fit and no movements. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 54g (S/M)

Seamless boxer designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex creating an ideal first layer garment in direct contact with the skin. Designed with microtensors on legs and back that guarantee a perfect fit and no movements. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 54g (S/M)

Technical toesocks designed for Trail Running and Alpinism. Thanks to the separation of the toes, the Ultra toesocks eliminate humidity in between toes avoiding blisters and allowing a natural position of the foot. Highly breathable mesh on instep and arch band to keep them always in the right position. Ideal for high intensity activities in medium and high temperatures.

Technical toesocks designed for Trail Running and Alpinism. Thanks to the separation of the toes, the Ultra toesocks eliminate humidity in between toes avoiding blisters and allowing a natural position of the foot. Highly breathable mesh on instep and arch band to keep them always in the right position. Ideal for high intensity activities in medium and high temperatures.

Flexible lightweight 500 ml (17 fl oz) flask with a wide opening for easy refilling with water, ice or salts. It folds, reducing its volume as you drink to minimize spilling and water sloshing and improving the liquid intake. 100% free of BPA and PVC. Ideal for use in trail running backpacks in medium and long distances.

FAST&LIGHT - 42g

Waterproofing for washing machine. This product adds Water Repellency to our breathable waterproof clothing. If the outer fabric of our waterproof garments absorbs water, the garment can lose up to 70% breathability. It is quick and easy to apply in the washing machine and its highly Durable Water Repellency (DWR) coating develops during air drying.

Breathable softshell clothing waterproofer. When the outer fabric absorbs water, the garment can lose up to 70% of its breathability. With use that DWR layer will disappear and will need to be renewed with Nikwax SoftShell Proof ™.

Ultralight headband designed to keep you dry and cool in high intensity activities. It prevents sweat from dropping into the eyes, keepin its position at all times. Built in a double layer of microfibre laser welded, the OS2O Headband dries fast, providing visibility, protection and comfort.

FAST&LIGHT - 18g 

Flexible lightweight 300 ml (10 fl oz) flask ideal for trail running belts. It folds, reducing its volume as you drink to minimize spilling and water sloshing and improving the liquid intake. 100% free of BPA and PVC. The perfect companion to stay properly hydrated in medium and short distance adventures.

FAST&LIGHT - 26g

Seamless thong for women designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 16g (XS/S)

Seamless briefs designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 37g (S/M)

Seamless briefs designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 37g (S/M)

Seamless briefs designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 37g (S/M)

Seamless briefs designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.

FAST&LIGHT - 37g (S/M)

Seamless panties designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 28g (XS/S)

Seamless panties designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 28g (XS/S)

Seamless panties designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 28g (XS/S)

Seamless boxer designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 54g (S/M)

Seamless boxer designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 54g (S/M)

Seamless boxer designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 54g (S/M)

Seamless boxer designed for high intensity sport activities. Thanks to its composition of Polypropylene Dryarn®, it provides high breathability and quick dry, together with spandex that guarantees a perfect fit, creating an ideal first layer garment in direct contact with the skin. No movement or chafing. A basic that provides comfort and performance in a minimum weight.  

FAST&LIGHT - 54g (S/M)

Seamless toesocks designed for Trail Running. Thanks to the separation of toes, the Trail Toesocks eliminate moisture in between avoiding blisters and allowing a natural position of the foot. Mini crew height that prevents gravel or mud from entering the interior. Good breathability and stability thanks to the instep mesh and arch band that avoids any movement of the sock. The Trail Toesocks ensure high performance and durability for medium and long distance trail running activities.

Seamless toesocks designed for Trail Running. Thanks to the separation of toes, the Trail Toesocks eliminate moisture in between avoiding blisters and allowing a natural position of the foot. Mini crew height that prevents gravel or mud from entering the interior. Good breathability and stability thanks to the instep mesh and arch band that avoids any movement of the sock. The Trail Toesocks ensure high performance and durability for medium and long distance trail running activities.

Seamless toesocks designed for Trail Running. Thanks to the separation of toes, the Trail Toesocks eliminate moisture in between avoiding blisters and allowing a natural position of the foot. Mini crew height that prevents gravel or mud from entering the interior. Good breathability and stability thanks to the instep mesh and arch band that avoids any movement of the sock. The Trail Toesocks ensure high performance and durability for medium and long distance trail running activities.

Seamless toesocks designed for Trail Running. Thanks to the separation of toes, the Trail Toesocks eliminate moisture in between avoiding blisters and allowing a natural position of the foot. Mini crew height that prevents gravel or mud from entering the interior. Good breathability and stability thanks to the instep mesh and arch band that avoids any movement of the sock. The Trail Toesocks ensure high performance and durability for medium and long distance trail running activities.

Seamless toesocks designed for Trail Running. Thanks to the separation of toes, the Trail Toesocks eliminate moisture in between avoiding blisters and allowing a natural position of the foot. Mini crew height that prevents gravel or mud from entering the interior. Good breathability and stability thanks to the instep mesh and arch band that avoids any movement of the sock. The Trail Toesocks ensure high performance and durability for medium and long distance trail running activities.

Thermal shocks made of an optimum blend of 4 different yarns. Wool brings thermal protection even when wet. Nylon and Acrylic ensure durability and resistance. Elastane guarantees a perfect fit. The perfect combination of new and old fibers to optimize comfort and performance even in extremely low temperatures.

The only technical cleaner specifically designed for hydrophobic and regular down which cleans effectively, while restoring water repellency and maintaining fill power and insulation.

High performance detergent for the OS2O waterproof membrane collection. It cleans and revitalizes breathability and water repellent properties. This product prolongs life to more technical garments.

Tenacious Tape Gear Aid by McNett is an all-purpose, transparent weatherproof repair tape that fixes rips, holes, taping and gashes in almost all kinds of outdoor gear. It stays put no matter what climate conditions appear and leaves no sticky mess. It is easy to apply and care. Tenacious Tape is the best option to repair O2 Waterproof Membrane and eVent fabrics in OS2O’s products.

Trail Running technical socks. Made in a highly breathable and durable Meryl® fabric. It also features Lycra Sport® for an optimun fit. It has an antibaterian treatment that prevents bad smells. It has a very soft touch. Ideal for outings middle and long distance.

Running and Trail Running Technical Toesocks. The RUN! Toesocks provide freedom of movement while preventing blisters as it eliminates moisture and friction between the toes. Its high component of Nylon® and Coolmax® guarantees good moisture management, resistance and outstanding durability on any terrain and shoe.

Running and Trail Running Technical Toesocks. The RUN! Toesocks provide freedom of movement while preventing blisters as it eliminates moisture and friction between the toes. Its high component of Nylon® and Coolmax® guarantees good moisture management, resistance and outstanding durability on any terrain and shoe.

Running and Trail Running Technical Toesocks. The RUN! Toesocks provide freedom of movement while preventing blisters as it eliminates moisture and friction between the toes. Its high component of Nylon® and Coolmax® guarantees good moisture management, resistance and outstanding durability on any terrain and shoe.

Running and Trail Running Technical Toesocks. The RUN! Toesocks provide freedom of movement while preventing blisters as it eliminates moisture and friction between the toes. Its high component of Nylon® and Coolmax® guarantees good moisture management, resistance and outstanding durability on any terrain and shoe.

Running and Trail Running Technical Toesocks. The RUN! Toesocks provide freedom of movement while preventing blisters as it eliminates moisture and friction between the toes. Its high component of Nylon® and Coolmax® guarantees good moisture management, resistance and outstanding durability on any terrain and shoe.

Lightweight compressible  200 ml (6.8 fl oz) softcup. Reduce waste plastic cups and hydrate quickly in your trail running trainings and competitions. It is reusable, foldable and it can be stored in a pocket or hanging from the softcup ring. BPA and PVC free.

FAST&LIGHT - 9g

Long neck straw (12 cm.) with valve in a 45 degree inclination to facilitate liquid intake. The valve has an open/closed position and can turn 360 degrees placing it next to the mouth avoiding taking the flask out when drinking. Compatible with SOFTFLASK 500, the LONG NECK valve is the fastest way to keep hydrated while in movement.

FAST&LIGHT - 33g