Heat Holders Worxx® Men's Big/Tall Bruce Contrast Long SocksExtra large size Extra long length Advanced thermal yarn More than 7X warmer than a basic cotton sock! Sensationally soft Non binding comfort fit All our ORIGINAL warmth but with a durable reinforced heel and toe, extra long length, and an extra large size. Keep feet warm on the coldest of days and pull on this pair of solid color, long length, reinforced Heat Holders for men, the warmest thermal sock. Thick, chunky and with a massive tog rating of 2.