SockGuy Men's Hottie Armwarmer Socks 75% Md Acrylic, 15% Spandex, 10% Nylon Made in US Machine Wash Sockguy arm warmers are made from the same ultra soft micro-denier acrylic as our socks, so they are the softest arm warmers in the industry Stretch-to-fit sizing Elasticized wrist-cuff