Dri-FIT fabric wicks away moisture to help keep feet dry and cool Arch Support provides a snug and secure fit Ventilated mesh for lightweight breathability Reinforced heel and toe for enhanced durability in high-wear areas Sizing: Small (3.5Y-6.0), Medium (6.0-8.0), Large (8.0-12.0), X-Large (12.0-15.0) Nike Elite Vapor Crew Sock, X-Large, University Red/Flint Grey MS1351567 MS1351567 884751267604