Powerstep's Arch Boosters are self-adhesive dense latex foam pads that are placed directly under the arch of the orthotic insert. They boost the foot arch support level of Powerstep® orthotic insoles, providing extra support for those needing high support or rigidity. Perfect for severely flat feet. Ideal for use in dress and casual shoes (slip-on's and low to mid heel dress shoes) and athletic shoes. Helps prevent over-pronation and flattening of the foot.