Hey, we can admit that sometimes, a ski is a more efficient mode of transportation. Say you're departing a backcountry hut, and the terrain is a gentle downhill with difficult turns on a narrow trail with obstacles. Pop these T1 Heel Lockers onto your Spark R&D bindings and you'll have better control when you're side-stepping and traversing back to your car. The lockers are forward-releasable as a safety measure. Compatible with Spark R&D Tesla T1 Arc, Surge, Women’s Arc, and Women’s Surge bindings.