The Surge ST is trusted by professional big line riders and mountain town legends alike. Its a powerful binding perfect for big days and big lines. Solid baseplate design, stiffer Asym Rip N Flip Highbacks, and more supportive Pillow Line Ankle Straps combine to give riders greater control in demanding terrain. All Surge ST bindings incorporate Sparks industry-leading Tesla T1 technology. Spark R&Ds NEW Smooth Touring (ST) Tech is featured on their ST Brackets and ST Whammy Bars. These components utilize a proprietary thermoplastic blend that is molded over the metal part reducing friction, increasing durability, and improving touring efficiency.