Looking for a jacket so light and warm you might forget you're wearing it? Our Fly Thermal W Jacket is exactly what you need. It's made entirely from our Castelli FFT (FLY Fabric Technologies) fabric to ensure lightness and warmth. We started by designing a GORE-TEX INFINIUM™ WINDSTOPPER® lining. Incredibly breathable, this high-performance fabric protects your chest from the wind to keep you warm, while also wicking away moisture perfectly. Next, we chose the lightest and warmest insulation, made from 100% recycled materials: CLIMA SL technology, which is both insulating and breathable. Finally, the outer shell is made from FLY SL fabric, also made entirely from recycled materials. It protects you from wind, light rain, and road spray in the event of a brief shower. We've also added a packable hood for extra warmth. It unfolds easily when needed thanks to its Velcro tab, whether the temperature drops or you stop. It sits perfectly under your helmet to prevent air from getting in. Like any good jacket, this model features a YKK® Vislon® zipper, three spacious rear pockets, a fourth zippered pocket for your valuables, an elasticated hem with a silicone gripper for a secure fit, and reflective strips for added safety on the road. This is how we designed an environmentally friendly jacket, ensuring all the performance you expect from a Castelli model.