These are Heat Holders' extra-long thermal boot socks, built from a heavy brushed yarn with a 2.34 tog rating the brand claims makes them over seven times warmer than a basic cotton sock. The long ribbed cuff and elasticated foot and ankle support suit tall boots and cold days outdoors. Against ordinary wool boot socks they trade some breathability for bulk warmth, and owners rate them highly for exactly that.
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Owners rate these very highly, praising the warmth, the soft brushed inside and the long leg that stays up in boots. The main caveat is bulk: they are thick, so snug boots get tighter.
These ribbed boot socks for men are made with an extra-long leg, so they work well under boots and for time outdoors in cold winter weather. They have the same warmth as the ORIGINAL Heat Holders Crew sock, with an elasticated foot and ankle for support.
The socks are made from a specially developed heavy bulk yarn with a long pile for cushioning. The inside of each sock is intensively brushed, which makes it soft and traps warm air close to the skin. The design is non-binding. The socks are rated as more than 7X warmer than a basic cotton sock.
