Teko OrganicSIN3RGI Lightweight Merino Casual Walking and Hiking Socks 36% Organic Merino Wool, 35% Evapor8, 23% Nylon, 2% Elastic Made in the USA and Imported Dries fast and is 40% more durable than pure merino SIN3RGI is a blend made from Teko M3RINO.XC wool and polyester manufactured from 100% recycled materials SIN3RGI does not itch or shrink Antimicrobial so these socks won't stink Chlorine free and created with an extremely low carbon footprint Dries fast and is 40% more durable than pure merino