This sock is designed for use with boots in the rigorous conditions of mines or smelters. Its 100% pure wool terry-knit inner layer provides insulation, added blister protection,  and aids moisture removal, without increasing foot temperature. Nylon on the outside of the sock provides abrasion resistance. 

The lower leg of the sock is knitted tighter to follow the shape of a normal leg and ankle, decreasing the possibility of its slipping into the boot without having to use elastane which would decrease moist air flow up the leg. A nylon outer layer provides durability, and protects the wool inner layer.

This sock has a 1 x 1 rib top with elastane in the welt only. This construction allows greater sideways stretch and is technically a better construction than an in turned welt top. The sock can be folded over the top of the boot for comfort and moisture removal.