Details The Rossignol x Rottefella Xcelerator Junior Skate Ski Binding is a racing binding for junior racers. The binding helps improve ski control during training and in competition races. Suits junior racers with shoe size 36 to 39. The NIS key included allows you to move the binding forwards or backwards based on snow conditions, terrain and technique. The binding is set with medium flex which easily can be replaced with harder or softer flex. The flex is a flexible pad which provides bending resistance and helps you control the skis. Binding System NIS-NNN (includes Prolink and Turnamic) Skiing Style Skate Flex Medium (Adjustable) Construction Moveable positioning with NIS key Boot Size Range US youth 4 - 6.5 (EU 36-39) Weight 198g Pair Rottefella X-Celerator Skate Ski Binding Junior