How Gamechangers work. Heat causes the inner arch chamber to become soft and expand, allowing it to take the shape of any foot. As it cools down, it retains the new shape and becomes firm, creating a true custom orthotic which balances the joints and prevent over pronation. As your arch starts to tire out and collapse after strenuous activity or on single hard impacts, the custom arch support holds it in place and prevents over pronation which causes serious injury, joint soreness and leads to arthritis. #patented #fptechnology .