The Cold Shade sleeves are constructed from Pearl's ELITE Transfer fabric with a full 50+ UPF of sun protection to shield your skin, plus Ice-fil and In-R-Cool technology that reflect heat, and elevate moisture transfer, keeping you as cool as possible on the hottest of days. The sleeves are easy to slide on, and lock into place on your bicep with a gripper, so you won't end up with an unsightly sunburned gap between your jersey and sleeves after a long day on the bike.