THE SPX 12 GRIPWALK® BINDING IS A HIGH-PERFORMANCE ALL-MOUNTAIN BINDING FOR AGGRESSIVE SKIERS.The combination of a Full Action toe piece and SPX heel deliver the longest elastic travel on the market for unmatched shock absorption. The result is instant power transmission and precise control with superior shock absorption to reduce unwanted pre-release. It's compatible with traditional Alpine ISO 5355 A and GripWalk® boot soles ISO 23223 A.