Palm Coolers are easy to put on by rolling down the upper arms, slipping in the hands, and rolling back up the arms. The greatest advantage in palm cooling is running in heat. The purpose of this product is to keep your core body temperature from rising when crossing that bridge between aid stations that can provide ice, cold water, or cold sponges. Insert ice cubes directly into the palm area of the pocket one hand at a time. This product is not intended to act as or replace the safety features of a cycling glove. On the bike, there is no proven palm-cooling benefit in keeping thumbs inserted however, the arm coolers do provide skin protection by blocking UVB rays to the arms and back of the hands and keeping you cool.