The Gore Bike Wear Universal 2. 0 Arm Warmers are true to their name, providing protection in a wide range of temperatures. The Universal arm warmers were sewn from a proprietary blend of Gore's nylonelastane Warmer fabric to provide protection in both hot and cold conditions. This blend is highly wicking, while also retaining its four way stretch properties. On cold days, of course, the extra layer reduces heat loss at the extremities. On the other hand, in hot weather both the White and Neon Yellow have been designed to reflect the sun's radiant energy to keep your skin cool. Grippers at the upper arms keep the warmers from slipping down and moving about. Reflective accents have also been added, even to the Neon Yellow, to increase your visibility in low light conditions. The Gore Bike Wear Universal 2. 0 Arm Warmers are available in sizes X Small to X Large, and they come in the colors White, Neon Yellow, and Black.