Strideline Athletic Crew Socks Boise State Charcoal Heather 4100511 Strapped Men 1% spandex Bold colors in digitally printed ink Double elastic calf provides stretch & performance Patented heel strap secures ankle mobility & fit. Stridetec wicking fabric optimizes breathability Double spun nylon gives increased arch support. Material Content may vary slightly. Approximately 42% Nylon, 39% Polyester, 15% Cotton, 3% Elastic, 1% Spandex Fits mens shoe sizes 6-12