Insulating fibers, gentle compression & moisture wicking for warm, dry feet. Cushion sole & shin protect from bumps & bruises. Spandex ankle panel holds sock comfortably in place. Smooth, flat toe seam adds comfort and durability. Fully thermalined leg and foot absorbs shock and insulates. Merino wool and acrylic blend moves moisture away from skin. 55% acrylic, 25% nylon, 19% Merino/wool blend, 1% spandex. Medium weight. 2-pack.