These 2 foam blocks attach to the sides of the boat and fit below the thigh braces, locking the knee in position. This improves posture in the boat and reduces strain on the knees and legs. 

Designed to work with existing boat thigh hooks, the pre-shaped wedges keep knees locked in an aggressive position even in the roughest water conditions. They are applied to the boat on the outside of each knee. Easy peel & stick installation. Two per set.