WHAT'S OUTSIDE RAISES HIGH EXPECTATIONS. WHAT'S INSIDE EXCEEDS THEM. The X-SOCKS® Skiing Light XXL Cuff is perfect for pros who take their feet to the limits of their endurance. X-SOCKS® Skiing Light XXL Cuff is made of especially fine knit so pros won’t lose the „feel“ for their skis. At the same time, they provide the ultimate in overall climate-control and protection for your feet. The newlydeveloped High-Flex shaft gives your calves plenty of freedom of movement; it is fashioned from a highlyflexible compound yarn in ribbed knit that adapts to any size leg without cutting into the skin.