Sandwich Wood + glass fiber, ABS sidewalls, high quality steel edges, high density - Graphite pad, nothing else. No metal, no interface ski / binding: Weight saving 30% XO: An authentic Swiss recipe, secret and unique result of hundreds of hours of testing in Switzerland with our customers and partners. XO's affairs: wood core to the hundredth of a millimeter processed. Choose Your Flex: V3 or V7 in all sizes.