NWT BOMBAS Merino Wool blend set of socks sz med (sz 8-10 1/2) Merino Wool Blend Calf Socks Merino Wool is a super strong natural fiber that's incredibly soft, will keep you warm in the winter and breezy-cool in the summer, and its natural moisture-wicking properties keep your feet dry and cozy. And that's just the fabric, before we add all of the sock tech features that come in every pair of Bombas. Features