Men's Bigfoot Original Thermal Heat Holders Socks 13-15 Us Navy Blue 91% Acrylic 5% Nylon 3% Polyester 1% Elastane machine washable BIGFOOT Extra Large socks to fit shoe size 13-15 us.When temperatures fall, pull on this pair of mens Heat Holders thermal socks and enjoy the extreme warmth that these seriously chunky socks will provide. The ultimate in thermal socks, these Heat Holders have a massive tog rating of 2.34 keeping your feet fully insulated with the specially developed extra heavy bulk yarn. The inside of each sock has been intensively brushed, giving them a sensationally soft feel, while holding more warm air close to the skin therefore keeping feet warmer for longer. The long pile cushioning, means these socks will not only help keep feet cosy but protected and supported too