The new Trail Thermal Jersey utilizes Polartec Power Grid fabric to keep you warm and comfy, all while being exceptionally breathable. It's the perfect option for cool days on the trail, or even as a long sleeve when you're grabbing a post-ride beverage. - Fabric Content: 91% Polyester, 9% Spandex Knit. - Front Kangaroo Pocket holds keys and cards with a secure fit.