Aircast AirHeel Ankle Support Brace with Stabilizers, MediumBrand: Aircast Color: Black Features: Designed with 2 interconnected air cells, located under the foot arch and in back of the Achilles tendon. Designed with 2 interconnected air cells, located under the foot arch and in back of the Achilles tendon Air cell technology provides pulsating pneumatic compression that minimizes swelling and enhances circulation Tested with 1,000 lbs. of pressure, enabling the air cells to withstand the force from running,