Teko Women's SIN3RGI Merino Wool Poly Blend Lightweight Casual Walking and Hiking Socks 31% M3Rino.Xc, 35% Nylon, 31% Evapor8, 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