BOBR Socks- ACTIVE are designed for high footwear such as rubber boots or skeletal ski boots. The two layered and heavy duty structure resists both moisture and abrasion. Massive drainage channels ventilate excess heat from footwear and silver eliminates bacteria. Soft parts, such as the bottom of the foot and shin, provide perfect protection against blisters and abrasions. Raised, heavy duty socks with silver have a one-year walk through guarantee.