Cariloha Crazy Soft Men's Athletic Socks - Buy 3 Get 1 Free! 10% elastane Simply add 4 pairs of socks to your shopping cart, and the discount will be added automatically! Signature arch support. Seamless toe construction. S/M: Size 7-10 L/XL: Size 10-13 62% Viscose from Bamboo / 28% Organic Cotton / 5% Nylon / 5% Spandex