The raising block kits give the sandals the extra bit of height where needed! Use 1 set to accommodate for leg length discrepancy or use 2 sets to raise the height of the footplate to maximize the available growth. Available in two sizes. 1 Riser = 0.7" 2 Risers = 1.3" 3 Risers = 2" 4 Risers = 2.7"