Like wearing a jersey with a built-in radiator, the Fox Racing Defend Delta Long-Sleeve Jersey features the advanced cooling technology of Polartec Delta fabric to regulate your temp as you battle hill climbs and enjoy freewheeling descents. This fabric regulates dry times and allows better breathability when wet, adapting to your riding conditions, while the abrasion-resistant Cordura knit panels resist the pull of snagging branches on narrow trails.