Chelsea Trainer Socks Size 6-11 are official product and is a one size fits all set. The pack has 1 pair in black makes a great gift which can be worn in training on the pitch or at home it will also keep you very warm during the winter seasons. The socks are made from a blend of 72% Cotton 27% Nylon 1% Elastane features in full colour Chelsea club crest and logo. Wash & care instructions on the label. The Chelsea Thermal 1PP Black Socks are an official Chelsea product made under licence for Chelsea Football Club.