Over three times warmer than wearing a basic cotton sock, Heat Holders Ultralite Stripe, Argyle & Patterned Socks are designed and made in the same way that the famous, thick-knit Heat Holders socks are, but without the bulk. This makes these mixed stripe pattern socks perfect for use with tighter-fitting shoes - something long-standing Heat Holder wearers have been crying out for. The socks have undergone the same process as any Heat Holders — advanced design thermal yarn from Japan, knitted then looped and brushed inside for a silky-touch, soft pile that traps warm air inside — but at a smaller, lighter level, producing a sock with a TOG rating of 1.0 and keeping your feet warm even in close-fit casual and formal shoes.