Stance Men's 6am Tie Dye Athletic Stripe Arch Support Classic Crew Sock 78% Cotton, 13% Spandex, 9% Elastane Imported Machine Wash Athletic Ribbed, Elastic Arch Support Reinforced Heel & Toe, Seamless Toe Closure Machine Wash in 40 C / 104 F., Avoid Bleaching or Ironing the socks Socks will last longer if you keep them out of the dryer Size : Medium - 6-8.5, Long - 9-12