Friction Proof
Promaker Friction Proof Inserts are designed to sit under the heel of the foot, between the ProMaker sock and the shoe. The inserts grip to the sock to stay firmly in place.
When in place the Friction Proof Inserts absorb bidirectional friction that travels to and from the heel to the joints (knee and hip joints particularly). By adsorbing excess friction, the inserts effectively reduce the daily placed stress on the joints.