The Castelli Mortirolo 6S Jacket lies at the less severe end of Castelli's winter range. It is intended to take the edge off dry, cold mornings and allow warm-blooded cyclists to ride without overheating.The upper chest and sleeves of the jacket are constructed from windproof yet breathable GORE-TEX INFINIUM™ WINDSTOPPER® X-Fast fabric, which has a fleece liner for added softness and warmth, while the lower body is made from thinner GORE-TEX INFINIUM™ WINDSTOPPER® fabric.Meanwhile, the back is constructed from a more breathable fabric with no windproof veneer, which allows moisture to escape freely. This combination of wind proofing at the front and breathability at the back helps you to maintain a stable core temperature in cool weather, regardless of your activity levels.Finished with a reflective panel at the chest and useful pockets, the Castelli Mortirolo 6S Jacket is minimalist and will keep you pleasantly warm on a fine winter's day.Features:Made for warm winters and cyclists who run hotGORE-TEX INFINIUM™ WINDSTOPPER® X-Fast fabric at the upper chest and sleevesGORE-TEX INFINIUM™ WINDSTOPPER® fabric at lower frontBreathable Warmer fabric at the back3 rear pockets for storageReflective panel on chestWeighs 337g (large size)For use at temperatures from 6-14°C, 43-57°F