Our customers agree that RoToTo's Double Face Merino Cotton Socks are the comfiest socks out there. Inspired by mountaineering socks, these socks have the feel of a sweatshirt. They feature a special two-layer knit: the outside is made out of a textured, organic cotton while the inside features a cozy, merino wool fleece pile knit that is thick yet fluffy. They are the ultimate comfort sock.