Pro Thermal Mid JerseyMidweight Warmer X-Stretch brushed fabric Ideal for use in cool temperatures, with or without a vest. The race cut and highly stretchy fabric provide a snug fit without compressing. Castelli Pro Thermal Mid Grey: Warmer X-Stretch brushed fabric.Midweight Warmer X-Stretch brushed fabric Ideal for use in cool temperatures, with or without a vest. The race cut and highly stretchy fabric provide a snug fit without compressing.Special construction in the pockets for a perfect fit at the waist. YKK® Vislon® zipper with flap. Embossed line on the torso Reflective vertical stripe on the center back pocket.