Strideline Premium College Football and Basketball Officially Licensed NCAA Athletic Fan Socks. Size Mens 5-13 The Most Comfortable Sock on Earth Worn by Elite Players in The NFL, NBA, and MLB. From Cotton 42%/Nylon 32%/Polyester 20%/Elastic 3%/Spandex 1%/Rayon 1% Imported Made by Strideline, a Seattle start-up founded in 2009 by high school entrepreneurs dedicated to making the most comfortable sock on earth. Keep your foot dry with Strideline's specialized Blend of TC Cotton, Microfiber Polyester, and StrideTec Compression Material Get a perfect fit everytime with Left/Right anatomical construction Soften impact with a terry cotton footbed on the most durable sock on the market Support your foot with multi dimensional compression pads worn by players in the NFL, NBA, MLB, and NCAA Support your foot with multi dimensional compression pads