Thick, chunky and with a massive tog rating of 2.34, Heat Holders are made from a specially developed heavy bulk yarn which has extreme thermal qualities. With long pile cushioning, these thermal socks will help keep feet fully comfortable and supported. Fit & Design: Fits Men's shoe sizes 13-15 Advanced thermal yarn More than 7X warmer than a basic cotton sock Sensationally soft Non-binding, and diabetic friendly Single pair pack