more expenzive bindings usually have more technology in them in order to give you a safer relese when you need it and don;t release when you don;t want too, the usually have a higher din setting, meaning that that the spring can hold your boot in tighter, since more aggressive skiers ski harder than beginners therefore need a better bindings, which = more expensive binding. Also they can be lighter in some cases by using titianuim and more expensive parts
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