OS2O

Base Layer

Men base layer for outdoor sports.

Base Layer

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Warmfit Merino 100 Shirt

The Warmfit 100 Merino T-shirt is a high-performance thermal garment for mountaineering and alpinism. Made entirely of merino wool, without blends, it offers a high thermal capacity even when wet, combining natural calorific properties with good breathability. Thanks to its soft touch and ergonomic cut, the Warmfit 100 is a versatile shirt, ideal as a base layer in winter and as an outer shirt on cool days.

FAST&LIGHT - 183g (S)

merino wool

Price €79.90

    Warmfit Merino 100 Shirt

    The Warmfit 100 Merino T-shirt is a high-performance thermal garment for mountaineering and alpinism. Made entirely of merino wool, without blends, it offers a high thermal capacity even when wet, combining natural calorific properties with good breathability. Thanks to its soft touch and ergonomic cut, the Warmfit 100 is a versatile shirt, ideal as a base layer in winter and as an outer shirt on cool days.

    FAST&LIGHT - 183g (S)

    merino wool

    Price €79.90

      Thermal Seamless Shirt

      T-shirt first layer it provides perfect regulation of body temperature. Made from a mixture of polypropylene and elastane seamless construction with thermo-active panels optimized to enhance ventilation in areas of increased sweating. Elastic, soft and adaptable to the body, with unrestricted action adjustment in movements, a ideal clothing for indoor aerobic activities at low temperatures or outdoor at medium temperatures.

      FAST&LIGHT - one hundred and forty-four grams . (S)

      Price €49.90

        Thermal Seamless Shirt

        T-shirt first layer it provides perfect regulation of body temperature. Made from a mixture of polypropylene and elastane seamless construction with thermo-active panels optimized to enhance ventilation in areas of increased sweating. Elastic, soft and adaptable to the body, with unrestricted action adjustment in movements, a ideal clothing for indoor aerobic activities at low temperatures or outdoor at medium temperatures.

        FAST&LIGHT - one hundred and forty-four grams . (S)

        Price €49.90

          SYN Cotton T-Shirt

          T-shirt made with SYN Cotton, fabric 100% recycled whichprovides a good performance in activity plus a soft and fresh touch similar to natural cotton. What. Thanks to its outdoor cut and high elasticity, it allows unrestricted movement, being a multi-purpose garment which can be worn during a medium-intensity activity or daily use.

          FAST&LIGHT - 128 g (S) 

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          Price €34.90

            SYN Cotton T-Shirt

            T-shirt made with SYN Cotton, fabric 100% recycled whichprovides a good performance in activity plus a soft and fresh touch similar to natural cotton. What. Thanks to its outdoor cut and high elasticity, it allows unrestricted movement, being a multi-purpose garment which can be worn during a medium-intensity activity or daily use.

            FAST&LIGHT - 128 g (S) 

            cool2dry.jpg UV protection Made in Spain 140.jpg

            Price €34.90

              Race Day Perforated T-Shirt

              Ultralight and breathable technical shirt without sleeves designed as underwear for very high intensity activities and competitions. What. Manufacture from fabric Effepi Avatar it combines microfiber from polyester and elastane, weighing just 75 grams. /m2 , the Race Day T-shirt fits smoothly like a second skin to let out moisture generated by the body and keep it cool and dry. Its microperforations enhance ventilation while providing greater elasticity in all 4 directions for better fit. A first layer that ensures light thermal protection, quick drying and comfort for days when moving fast is a priority.  

              FAST&LIGHT - 45 grams

              effepi.jpgOS2O hecho en España

              Price €34.90

                Ultra Ridge T-Shirt

                Lightweight technical t-shirt designed to keep you cool and dry in high intensity activities. Made of 100% recycled Cool2Dry® microfiber fabric, it has a very soft touch in contact with the skin, extremely quick drying and protection UPF 40 against ultraviolet radiation.   

                FAST&LIGHT - 78g

                UV protectionMade in Spain 140.jpg

                Price €34.90

                  Ultra Ridge T-Shirt

                  Lightweight technical t-shirt designed to keep you cool and dry in high intensity activities. Made of 100% recycled Cool2Dry® microfiber fabric, it has a very soft touch in contact with the skin, extremely quick drying and protection UPF 40 against ultraviolet radiation.   

                  FAST&LIGHT - 78g

                  UV protectionMade in Spain 140.jpg

                  Price €34.90

                    Racing Summit T-Shirt 2024

                    Technical and ultra-light shirt without sleeves designed for keep you cool and dry in competitions and high demand trainings. Made in fabric of Cool2Dry® pierced that thanks to its air channels provides extra ventilation and improves heat dissipation in moments of great effort; in addition, it offers a soft touch in contact with the skin. Ideal for intense activities in high temperatures.

                    FAST&LIGHT - 60g

                    cool2dry.jpg UV protection Made in Spain 140.jpg

                    Price €32.90

                      Racing Summit T-Shirt 2024

                      Technical and ultra-light shirt without sleeves designed for keep you cool and dry in competitions and high demand trainings. Made in fabric of Cool2Dry® pierced that thanks to its air channels provides extra ventilation and improves heat dissipation in moments of great effort; in addition, it offers a soft touch in contact with the skin. Ideal for intense activities in high temperatures.

                      FAST&LIGHT - 60g

                      cool2dry.jpg UV protection Made in Spain 140.jpg

                      Price €32.90

                        Airlite Shirt

                        The AIRLITE T-Shirt is an ultra-lightweight, seamless shirt designed for maximum comfort and performance. Made from 100% Dryarn®, a cutting-edge polypropylene fiber, this shirt excels in breathability and thermal insulation, keeping your body dry even during intense activities. Weighing just 75 grams, it’s perfect as a base layer in cold conditions or as an outer layer in mild or warm climates. This shirt is ideal for trail running, mountaineering, and skimo, where weight and performance are crucial.

                        FAST&LIGHT - 75g (S)

                        Made%20in%20Spain%20140.jpgDryan

                        Price €32.90

                          Airlite Shirt

                          The AIRLITE T-Shirt is an ultra-lightweight, seamless shirt designed for maximum comfort and performance. Made from 100% Dryarn®, a cutting-edge polypropylene fiber, this shirt excels in breathability and thermal insulation, keeping your body dry even during intense activities. Weighing just 75 grams, it’s perfect as a base layer in cold conditions or as an outer layer in mild or warm climates. This shirt is ideal for trail running, mountaineering, and skimo, where weight and performance are crucial.

                          FAST&LIGHT - 75g (S)

                          Made%20in%20Spain%20140.jpgDryan

                          Price €32.90

                            Seamless Compression Tech Shirt

                            Short sleeve compression t-shirt for men and women. Tight cut that adapts to the body like a second skin. It offers the maximum thermal insulation, with an efficient transpitation to keep the body dry all the time. Thermo-regulating effect that gives the garment the condition of cold or heat depending on the conditions and intensity of the activity.

                            FAST&LIGHT - 123g (S)
                            Made%20in%20Spain%20140.jpgDryan

                            Price €32.90

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