Superfeet Run Pacer Elite insoles feature a Carbitex® carbon fiber plate that responds to the way you move, delivering flexibility at low speeds and stiff leverage for high-speed power. SuperRev™ foam optimizes energy return and provides arch support that works with your body’s natural biomechanics. Designed to replace the removable liner in moderate to roomy running shoes.Insoles are designed to replace the sockliner in roomy to moderate-fitting running and walking shoes. Trim to fit your shoe size.