Teko SIN3RGI Lightweight Merino Wool Freeride World Tour Ski and Snowboard Socks 42% M3RINO.XC/40% EVAPOR8/15% Nylon/3% Elastic Made in the USA and Imported Dries fast and is 40% more durable than pure merino SIN3RGI is a blend made from Teko's M3RINO.XC merino wool and polyester manufactured from 100% recycled materials