Dominic Twist Heel & Toe Crew Sock, Navy/Denimhe same warmth and comfort as the original Heat Holders® crew sock, now in a striking and fashionable twist design. Keep feet warm on the coldest of days and pull on this pair of twist color crew length Heat Holders® for men, the warmest thermal sock. 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