Adjustable Heel Lift - Three layers of 1/8" natural sponge rubber topped with faux pig lining to easily correct leg lenth discrepancy. By removing one or more layers it will better balance for standing and walking.Most lifts that are similar to these are sold as singles, not in pairs. Ours is priced by the pair so you are getting 2 for the price of 1.Available in small, medium & large. Made in USA.