Spark R&D T1 Step Locker
Work very well, just had to ski 6 miles today out of a hut because the snow was to deep and not steep enough to snowboard.
I can't say that they are straight forward yet! I have spark r&d hitchhiker bindings and it seems there is just a narrow bit of plastic restricting free slide of the locking piece.
Great product, easy install. Will be hugely helpful touring.