Easy Transfer from Shoe to Shoe! When used in both shoes at the same time, they can provide balanced elevation. Heelix Leg Length Lifts provide excellent shock absorption and can be stacked for a custom amount of lift. These lifts are easily cut to size with sharp scissors. Surface is high friction, almost non-slip. Heelix Leg Length Lifts are designed for the treatment of anatomical and physiological leg length deficiencies. Molded from a pliable, resilient, washable plastic these lifts sit comfortably within the shoe and provide a flat platform under the heel to ensure the correct amount of lift.