OS2O FAST&LIGHT

Base Layer

Men base layer for outdoor sports.

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W-Series Merino Baselayer W-Series Merino Baselayer

W-Series Merino Baselayer

A first layer with very high thermal protection that combines the best of two fabrics: the thermoregulation and natural antibacterial properties of merino wool with the adaptability and ventilation of Polar Stretch Grid® fabric. Positioned in strategic areas, they create a warm, comfortable, and highly versatile garment. The feature you'll appreciate the most is its built-in neck gaiter, which prevents cold from entering through the neck and, thanks to its length, can also be worn as a hat, keeping you warm and protected at all times. Ideal for FAST&LIGHT activities in severe cold conditions.

FAST&LIGHT - 286 g.  (S)

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Price €89.90
    Warmfit Merino 100 Shirt - Black Warmfit Merino 100 Shirt - Black

    Warmfit Merino 100 Shirt - Black

    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 - Grey Warmfit Merino 100 Shirt - Grey

      Warmfit Merino 100 Shirt - Grey

      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 - Seaport Warmfit Merino 100 Shirt - Seaport

        Warmfit Merino 100 Shirt - Seaport

        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 - Navy Warmfit Merino 100 Shirt - Navy

          Warmfit Merino 100 Shirt - Navy

          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 - Black Thermal Seamless Shirt - Black

            Thermal Seamless Shirt - Black

            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 - Blue Thermal Seamless Shirt - Blue

              Thermal Seamless Shirt - Blue

              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
                Ultra Summit T-Shirt 2024 - White / Black Ultra Summit T-Shirt 2024 - White / Black

                Ultra Summit T-Shirt 2024 - White / Black

                Camiseta técnica y ultraligera de manga corta diseñada para mantenerte fresco y seco en competiciones y entrenamientos exigentes. Confeccionada en tejido de Cool2Dry® perforado que aporta una ventilación extra y mejora la disipación del calor en los momentos de alta intensidad; además, ofrece un tacto suave en contacto con la piel.  

                FAST&LIGHT - 64g

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                Price €34.90
                  Ultra Summit T-Shirt 2024 - Seaport / Spectra Ultra Summit T-Shirt 2024 - Seaport / Spectra

                  Ultra Summit T-Shirt 2024 - Seaport / Spectra

                  Camiseta técnica y ultraligera de manga corta diseñada para mantenerte fresco y seco en competiciones y entrenamientos exigentes. Confeccionada en tejido de Cool2Dry® perforado que aporta una ventilación extra y mejora la disipación del calor en los momentos de alta intensidad; además, ofrece un tacto suave en contacto con la piel.  

                  FAST&LIGHT - 64g

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                  Price €34.90
                    SYN Cotton T-Shirt - Cervino SYN Cotton T-Shirt - Cervino

                    SYN Cotton T-Shirt - Cervino

                    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 - Anayet SYN Cotton T-Shirt - Anayet

                      SYN Cotton T-Shirt - Anayet

                      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
                        Race Day Perforated T-Shirt Race Day Perforated T-Shirt

                        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
                          Airlite Shirt - Black Airlite Shirt - Black

                          Airlite Shirt - Black

                          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)

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                          Price €32.90
                            Airlite Shirt - Turquoise Airlite Shirt - Turquoise

                            Airlite Shirt - Turquoise

                            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
                              Racing Summit T-Shirt 2024 - Seaport Blue Racing Summit T-Shirt 2024 - Seaport Blue

                              Racing Summit T-Shirt 2024 - Seaport Blue

                              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

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                              Price €32.90
                                Racing Summit T-Shirt 2024 - White / Black Racing Summit T-Shirt 2024 - White / Black

                                Racing Summit T-Shirt 2024 - White / Black

                                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

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                                Price €32.90
                                  FAST&LIGHT Organic T-Shirt FAST&LIGHT Organic T-Shirt

                                  FAST&LIGHT Organic T-Shirt

                                  Light and fresh shirt manufactured in 100% organic cotton lightweight of 145g. /it's very comfortable, even on the hottest days. Ideal for trekking, climbing or pre or post activity.

                                  FAST&LIGHT - 132 grams (S)

                                  OEKO-TEX® STANDARD 100.jpgORGANIC CONTENT STANDARD 100.jpgfair_wear.jpg

                                  Price €24.90
                                  • Out of stock