Super-lightweight construction with amazing warmth and protection Castelli FLY Fabric Technologies: FFT GORE-TEX INFINIUM WINDSTOPPER inner lining CLIMA SL Insulation for extra warmth FLY SL Shell for wind and rain protection 100% recycled post-consumer outer shell and lining Top and bottom-opening YKK Vislon zipper 3 back pockets with zippered security pocket for valuables Elastic and silicone at waist to keep jacket in place Reflective tabs for added safety Weight 291 g (S) 0-12°C / 32-54°F