Most of us wear long-sleeve jerseys for a few days in spring and fall, then extend their reach with a vest in cooler weather, and then pull them off again for insulation duty under a jacket in extreme cold. So a thermal jersey doesn’t have to be bulky or complicated, but you don’t want it to be boring. We built this with all the essentials, like great material and fit, perfect pockets, and our lightweight easy-slide YKK Vislon zipper. Features: Warmer fabric. Castelli stripe logo across upper chest. Lightweight YKK Vislon easy-slide zipper. 3 back pockets with Castelli drop-pocket construction.