Stay completely focused when riding in cool conditions. The Core Seamless Base Layer in Short Sleeves has a totally seamless design so there is no niggling discomforts even under race-fit, aero jerseys.The base layer is made from a mix of polyester and polypropylene to create an exceptionally stretchy fit so your freedom of movement is unencumbered. The blend of yarns is also soft to the touch, warm, and high wicking for when the tempo increases and your body is working harder. Light weight sections on the side and back reduce bulk where you don’t need quite so much insulation and help give the base layer its almost unnoticeable feel when you’ve got it on. A wide neck sits easily under short-collared jerseys. Key Features: 84% polyester/16% polypropylene yarns provide softness, warmth, wicking, and exceptional stretch fit,Seamless construction means extra comfort,Lighter weight on side and back,Wide neck opening to fit under short-collared jerseys,8° – 20°C / 46° – 68°F,Weight: 151g (Large).