Sold in pairs Heel Lift Inserts for athletic shoes / trainers Increase heel-to-toe drop by 1/2" Small (fits Men's/Women's 6-8.0 US shoes), Medium (Men's/Women's 8.5-13 US), Large (Men's 13.5+ US), Durable polymer construction with No-Slip Cleat Technology to secure inserts in place The VersaLifts ENDURANCE is our most compressible insert designed for workouts involving higher volumes of agility, plyometric, and running movements. The ENDURANCE absorbs shock from impact limiting the amount of stress on joints, bones, tendons, etc. Simply insert VersaLifts to gain an additional 1/2” heel to toe drop with maximum cushioning. (Sold in pairs) Made with the optimal durometer of polymer to improve squats while staying lightweight and comfortable for higher volume plyometrics and running. 1/2" heel raise. No-Slip Cleat Technology securing VersaLifts in place. VersaLifts are ideal for: Air Squats Pistol Squats Running Box Jumps Wall Balls Double Unders Jumping And many more. Sizing: Small (Men's/Women's 6-8.0 US) Medium (Men's/Women's 8.5-13 US) Large (Men's 13.5+ US) What is the difference between the HYBRID, the STRENGTH and the ENDURANCE? The HYBRID (Dark Green) is our most versatile heel lift, designed to provide the optimal amount of heel lift to improve squat positioning and range of motion without inhibiting plyometric or running movements. They are perfect for workouts that combine squats, olympic lifts, and plyometrics. The STRENGTH (gray) is our most rigid insert designed to bear the heaviest of loads specifically for strength training. These inserts are ideal for powerlifting and olympic weightlifting. The ENDURANCE (black) is our most compressible insert designed for workouts involving higher volumes of agility, plyometric, and running movements. These inserts absorb shock from impact limiting the amount of stress on joints, bones, tendons, etc.