Superfeet Run Pacer Elite insoles feature a Carbitex(R) carbon fiber plate that responds to the way you move, delivering flexibility at low speeds and stiff leverage for high-speed power. SuperRev(TM) 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. FEATURES AND BENEFITS Contoured arch support enhances foot biomechanics Carbitex(R) carbon fiber plate boosts forward propulsion Sculpted heel secures the foot as you move Moisturewick(TM) top cover helps reduce odors and keeps feet fresh SuperRev(TM) foam increases energy return 39% more responsive than traditional insoles Superfeet insoles keep their shape, delivering reliable support and comfort for up to 12 months or 500 miles, whichever comes first Arch Height: All Arch Heights Insole Thickness: Max Underfoot Cushioning: Middle