Any body who breaks the high backs on these bindings are complete morons. Humans can not break these binding while "snowboarding" unless in a wreak with a rock or catastrophic manufacture defect (highly rare). A chair lift on the other hand can snap them in two. Carbon Fiber is much stronger than plastic. That is why chairs can break them more easily. Carbon fiber high backs will break before they bend. Plastic highbacks will bend much more if a chair (and 1 or 2 adults) wrenches on it. If you are looking for a stiff responsive binding with no forgivness, look no further. I've brussed my tibia thru my driver Xs once (or twice) because I didnt see a ice chunck while riding at warp speed. I didnt wreck, the iertia traveled right through the binding. Be careful while loading on low chairs and dont step on the straps and these will last for years, even if you ride 70+ days a year. If your not one of the fastest riders on the hill you wont need these!