Hiking, trekking Upper (instep): 54.9% Polyester, 41.7% Cotton, 3.4% Spandex(Excluding elastic components and decorative yarns) COOLMAX® yarn wicks moisture quickly to keep feet dry and comfortable. Lycra® provides a snug, supportive fit with excellent stretch. Breathable mesh construction allows heat and moisture to escape efficiently. Terry cushioning at heel and toe reduces pressure and impact during long hikes. Arch support band keeps the sock in place and prevents slipping. Seamless toe construction minimizes friction and irritation. 3D heel design ensures a secure, non-slip fit. Polygiene® treatment helps control odor for long-lasting freshness.