This is the workhorse jacket in the Castelli winter lineup. We use our warmest GORE-TEX INFINIUM™ WINDSTOPPER® fleece-lined fabric on the front and back to keep the wind out and the heat in. For the back of the sleeves and side panels we use a lighter-weight GORE-TEX INFINIUM® WINDSTOPPER® for better fit and breathability. We keep the lines clean and don't add anything superfluous — unless you think the big reflective stripes front and back are superfluous. Functional details are all there, as you expect from Castelli: an easy-sliding YKK® Vislon® zipper and three big pockets for storage, along with a zippered key pocket for valuables. The Raddoppia 3 Jacket will keep you warm and seen all winter long.