By fusing together low-micron merino wool and polypropylene fibers, you get an incredibly strong yarn that allows a middleweight to act like a heavyweight in both warm and cold climates. They're strong, wicking, odor and blister resistant, breathable, quick drying... and they immediately recover in the wash. Made in the USA.

Content: 33% Merino Wool, 33% Polypropylene, 26% Nylon, 5% Elastic, 3% Lycra®

Mens shoe sizes: Medium (5-8), Large (9-12)

Womens shoe sizes: Medium (8-11)