Our "barely there" sock, the Women&';s Foliage Lightweight Crews are made of a Fine Micron Merino Wool, creating a smooth, lightweight, and comfortable fit that adapts to temperatures year round. They&';re so comfortable, you might forget you&';re even wearing them. WIDE FLEX STRETCH Comfort without constraint in all the places you need it: from calf to toe. Easy on, easy off, and easy everything-in-between. FINE MICRON MERINO WOOL Fine micron Merino Wool creates a smooth, lightweight, and comfortable fit that adapts to temperatures year round. TRUE SEAMLESS TOE The best feature you&';ll never notice. Materials - 64% Merino Wool, 33% Nylon, 3% Spandex