Defeet Armskins Wool In parts of Northern France and Belgium there exist roads made of cobblestones that have lasted for centuries. DeFeet made ArmSkins to stand up to the punishment that these roads and the inclement weather dish out. ArmSkins Stayfast cuff and secure binding keep them right where you put them no matter how bad the conditions get. ArmSkins are also excellent for running and hiking. Made from wool. - 66% Merino Wool, 31% Nylon, 3% Lycra ArmSkins Wool take cool and damp weather cycling and running to a more comfortable level. Wool is a wonderful fiber with tremendous insulation qualities, even when wet.