SockGuy Channel Air 2in Turkey Trot Cycling/Running Socks (Turkey Trot 2013 - S/M) Size Medium 5 channels of cool air mesh ventilation on foot bottom and 5 channels of plush terry padding lightweight blend of cushioning, moisture control, and comfort 75% moisture wicking micro denier acrylic, 15% nylon, 10% spandex Arch support that eliminates slipping and sagging while reducing fatigue Easy fit cuff features a non-binding cuff