Spark took the ready-to-rage Surge ST binding and went over every component with a fine-toothed comb looking for ways to improve performance and drop weight. The product of that effort is the new Spark R&D Surge ST Pro Splitboard Bindings, and they’re a thing of beauty. When you can’t afford to give up performance going uphill OR downhill, and you’re going deep enough for every gram to count, the Surge ST Pro is the way to go.