Designed to work with existing boat thigh hooks, the pre-shaped wedges are placed to the outside of the knees. They keep knees locked in an aggressive position and reduce leg fatigue dramatically. Outside knee blocks are the place to start when you are upgrading your stock outfitting. Hand made blocks can be tricky to shape and glue in yourself. The easy peel & stick installation makes instillation a breeze. Self stick glue on the rounded surface cuts oodles of time off of your outfitting project freeing you up for more valuable pursuits like drinking beer and watching kayaking videos.