Lululemon All In A Day Sock These lightweight socks have a low-profile cuff that's perfect for everyday adventures in your favorite sneakers. WOMENS SOCK SIZES: S/M= 5-7, M/L=7.5-10 Naturally breathable mesh and sweat-wicking yarns help keep your feet cool and dry Y-shaped heel keeps your socks from slipping down. Left and right toe shape reduces bulk. Snug-fitting arch support. 55%Polyester, 29% Nylon, 13% Cotton, 3% Lyrcra Elastane.