Twin City Nylon Baseball Sock NSSTY Baseball/Softball Sanitary Colored Knee High Socks. 99% Nylon, 1% Elastic. Over the Calf, Knee High, Lightweight Tube Sanitary Socks. Sanitary Socks worn under stirrups and also without. Worn by Baseball, Softball and Fastpitch Players from Youth Little League and Travel Ball to High School, College & Professional Players and Teams. Available in 20 Different Colors in Youth & Adult Sizes