Equipped with 2 interconnected aircells, located under the foot arch and in back of the Achilles tendon | Aircell technology provides pulsating pneumatic compression that minimizes swelling and enhances circulation | Universal fit allows the Aircast AirHeel to be worn on either the left or right foot | The Aircast AirHeel is constructed of lightweight, breathable materials, making this brace extremely comfortable | Easy to wear, simply slip the brace on like a sock, and adjust the Velcro strap for the proper fit