Every model in K2' s massive ski collection features one of five variations of the rocker concept: All Terrain (moderate tip rocker plus camber), Speed (very mild tip rocker plus camber), Catch Free (mild tip-and-tail rocker plus camber), Jib (mild tip-and-tail rocker plus a flat midsection), and Powder (rockered forebody plus cambered rear). Like all models in K2' s Backside Adventure series, the BackUp features holes in the tip and tail to accommodate pre-cut climbing skins (sold separately). Built for serious ski mountaineers or resort telemarkers, the BackUp has a lightweight core for climbing ease and two sheets of metal for edge grip and integrity. Speed rocker preserves the grip and responsiveness of camber with a touch of rocker for maneuverability. The topsheet consists of a snow-shedding material that prevents buildup during ascents.