Designed for use with R21 (WC and Racing) and the new R22 WC race plates, the SPX 15 ROCKERFLEX is an elite-level, competition race binding. The strongest coupling strength and longest elastic travel on the market deliver instant power transmission, precision, and control with superior shock absorption for reduced pre-release. The short mounting zone and semi-suspended heel enhance ski flex for more precision and control.ROCKERFLEX: THE ROCKERFLEX CONCEPT IS DERIVED DIRECTLY FROM THE PROTOTYPES USED BY OUR WORLD CUP RACERS. WITH ITS SMALLER BINDING ATTACHMENT AREA AND SEMI SUSPENDED HEELPIECE, IT PROVIDES ENHANCED CONTROL OVER THE SKIS FLEX, WHILE RETAINING MAXIMUM PRECISION: WITHOUT CONTROL, POWER IS MEANINGLESS!ELASTIC TRAVEL: More elastic travel results in more reliable retention to keep you in when you need.LOOK bindings boast the most lateral travel before release and the fastest re-centering, delivering superior shock absorption and reducing unwanted pre-release.MULTI DIRECTIONAL RELEASE: All the LOOK bindings have a 3D multi-directional release which reduces the risk of injury in all the different cases of fall, even the combined ones. In addition, the boot sole is always under a constant pressure : this provides a better control and a better stability when the skier drives his skis.SHORT MOUNTING ZONE: The shortest mounting zone of any alpine binding available provides less swing weight, improved response, and a deeper, rounder, more consistent ski flex.