Farm To Feet Sunderland Crew Sock61% Merino Wool, 36% Nylon, 3% Spandex Seamless toe Reinforced construction Advanced construction that sandwiches stretch yarns between two layers of body yarn, hidden nylon plaiting creates a smooth exterior and a low profile fit that is ideal for technical and sport socks. A side benefit of this modern knitting technique is its ability to incorporate complex patterns, open weave zones, and intricate designs for increased performance and extra style.