Men's Bigfoot SLIPPER Thermal Heat Holders Socks 13-15 Us Black / Grey 91% Acrylic 5% Nylon 3% Polyester 1% Elastane Imported machine washable The massive tog rating of 2.34, these seriously chunky slipper socks are made with a specifically developed extra heavy bulk yarn Superwarm and thermal BIGFOOT size 13-15 us Non slip soles - Available in 4 colours and two sizes See my Amazon shop for other options for women and kids A superb gift!