Rottefella Xplore Backcountry Hard Flex provides increased resistance against the boot and a more controlled descent. Flex is a flexible pad which provides bending resistance. It helps you control the skis and gives you a more natural kick-and-return cycle. You can easily change the All-Round flex that comes with the binding to Rottefella Xplore Hard Flex for a better experience when skiing downhill. Sold in pairs.