Craft Sportswear Men's Bike Cycling Winter Cold Weather Ergonomic Arm Warmers: protective/riding/compression/cooling 87% Polyester, 13% Elastane Imported The Thermo Cool fabric is made of two high-tech polyesters and has a brushed inside offering superb thermoregulation in fair and cold conditions Thin, lightweight and elastic fabric for freedom of movement Elastic silicone grippers keep the arm warmers in place Ergonomically placed seams follow the moving body Elastic seams in contrast color