Teko SIN3RGI Merino Wool Poly Blend Lightweight Casual Walking and Hiking Socks 33% M3RINO.XC merino wool/33% SIN3RG recycled polyester/31% EVAPOR8 nylon/3% elastic Made in the USA and Imported 33% M3RINO.XC merino wool/33% SIN3RG recycled polyester/31% EVAPOR8 nylon/3% elastic SIN3RGI is a blend made from Teko's M3RINO.XC merino wool and polyester manufactured from 100% recycled materials