Made for cyclists looking for extra warmth during chilly autumn months, the Pearl Izumi Men's Barrier Cycling Base Layer keeps you warm and dry when it's layered under a cycling jacket or vest, wicking moisture off your skin for optimal temperature regulation. Wind blocking Barrier fabric along the chest shields your core from whipping winds on brisk autumn days. The base layer's P. R. O. Transfer Dry fabric is powered by 37. 5 Minerale polyester for enhanced moisture transport and evaporation. 37. 5 Minerale polyester works by embedding active particles at the fiber level to effectively capture and release built up perspiration. In fact, this fabric provides 800% more surface area to the fiber, removing moisture vapor more efficiently than standard polyester fabric. Other key features include a cycling specific cut with rotated sleeves, as well as an anatomic, close to body fit.