Cloud 9 lies in each stride when you sport these DeFeet running socks. Durable CoolMax Xtralife fabric has a low-bulk design for a great fit and feel. Stretch construction provides a subtle compression feel. Dense padding throughout footbed for exceptional comfort. Each sock is marked with the size for easy pairing. 64% CoolMax Xtra Life, 20% nylon, 11% Lycra, 6% elastic. Machine wash cold, tumble dry low.. Made in the U.S.A. Sold as a 4-pair pack.