Merino Wool is a super strong natural fiber that's incredibly soft, helps keep you warm in the winter and breezy-cool in the summer, and even naturally wicks moisture to help keep your feet dry and cozy. And that's before we add other supportive yarns for that perfect fit, and all the other comfort tech that keeps your arches supported and your toes seam-free. Women's Merino Wool Blend Half Calf Sock 4-Pack - Pink Iris Mix - Medium - Bombas