Hiking, Trekking Instep: 54.9% Polyester, 41.7% Cotton, 3.4% Spandex(Excluding elastic components and decorative yarns) Terry cushioning at heel and toe reduces pressure and minimizes friction from shoes. Seamless toe construction prevents irritation and rubbing. 3D heel design ensures a secure, non-slip fit. Left and right foot-specific design enhances overall comfort. Elastic arch support band provides a snug and stable fit. COOLMAX® yarn wicks moisture quickly to keep feet dry and comfortable. Lycra® fibers offer excellent stretch and supportive fit. Breathable mesh construction improves ventilation and moisture release. Polygiene® anti-odor treatment keeps socks fresh for longer.