Patented design for heel elevation, not a pad or cushion. Sold 1 per package;Placed under the footbed or insole, the heel lift molds to the shoe, so both shoes fit & feel alike;Durable clear vinyl conforms but doesn't compress, and retains its height even with extended use;Long constant slope supports the arch, avoids bridging heel & ball of the foot, reducing arch stress;Transparent material is ideal for sandals