The Pro11 Dual Shock Insoles have been designed to alleviate pain and aid the healing of sports injuries. These insoles will fit most walking, running and sports shoes, and are intended for individuals with plantar fasciitis, heel pain, knee pain, metatarsal pain and lower back pain. With every step that you take on a hard surface, your feet absorb shock. If your feet are not properly protected, this constant impact can be tough on them and can cause fatigue, pain and injury. Designed specifically for sports, the Pro11 Dual Shock Insoles effectively absorb shock on impact to prevent pain and injury.