Designed for feet that hurt. Providing a comfort fit for skiers on easy to varied terrain who wear rental boots to ensure maximum warmth, protection, comfort and best fit. Exclusive THORa LONA(R) and THORa WICKA(R) blend for maximum WICKING because a dry foot is a warm foot. Cushioned arch for better fit (Spandex for support). Thick cushioning in ball and heel for WARMTH, SHEAR PROTECTION and COMFORT. Cushioned shin and instep PROTECTS AGAINST SHIN BITE. Ventilation panel for BETTER AIR CIRCULATION. Specifications Length: Over-Calf Cushion: Maximum Cushion Fiber Contents: 59% Exclusive THORa LONA(R) Acrylic , 2% Elastic , 39% THORa WICKA(R) Proudly made in the USA