The new Flex-Lock system from Karakoram Bindings is an extra strap that you can attach to any highback in the range. It stops your boot from having too much lateral flex which is an issue when touring using the splitboard as skis. The Flex-Lock helps by fixing your boots to the highback when hiking, for a stable platform to make it up the mountain, then at the top, you can unclip it, and have all the freedom of movement you want for the ride back down.
Karakoram Flex-Lock Review | Best New Splitboard Bindings ISPO 2016
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