The Crab Grab Born Throns are using THORN-SPIKES to hold your snowboard boots in place. The curved, thorn-shaped spikes hook into your boot treads & gives amazing grip. Crab grab uses a secret blend of materials creating the CRUBBER that allows the stop pad to flex naturally with your board. The SCREW GLUE is a super strong resin that sticks to your board, like it was screwed on. The Board Throns comes with two independent pads that allow you to place them directly under your toe & heel for maximum control.