Designed for feet that don't hurt. Providing a custom fit for skiers on difficult to challenging terrain, wearing technically advanced custom fitted boots and who prefer ultra thin cushioning/protection. Exclusive THOR•WICK® is used for maximum WICKING because a dry foot is a warm foot. Extra Spandex in the ankle for PRECISE FIT. Pique stitching in the calf and arch for STRETCH and FIT. Reinforced fl at knit for WARMTH, PROTECTION and COMFORT.