DeFeet Armskin Arm Warmers 49% Coolmax EcoMade/ 47% Nylon/ 4% Lycra Made in US Patented, award-winning Armskins are designed specifically to withstand damp, chilly runs and hikes Long wristband offers extra warmth, while SeCurl no slip band on biceps keeps everything firmly in place Lack of vertical seams ensures consistent, aerodynamic fit Made of 49% Coolmax EcoMade (created from recycled plastic bottles), 47% nylon, and 2% Lycra; machine washable Includes limited one-year manufacturer's warranty