Keep your Aircast SP (Short Pneumatic) Walker Brace / Walking Boot like new with this replacement foam liner and insole. This lining can be hand washed with a mild detergent; simply allow to air dry. Universal fit allows the Aircast Replacement Foam Liner with Insole to be worn on either the left or right leg. The Aircast SP (Short Pneumatic) Walker Brace / Walking Boot (sold separately) is a removable cast that will not limit mobility required for day-to-day activities while recovering from injury. It's specifically designed to provide protection and pneumatic support for stable fractures of the foot and ankle, severe ankle sprains, soft tissue injuries, chronic conditions including plantar fasciitis, metatarsal fractures, forefoot and midfoot injuries, bunionectomies and post-operative use. The low rocker sole promotes a natural ambulation (gait) for improved mobility while the generous foot base has ample room for dressings without sacrificing comfort. The lightweight, semi-rigid shell has a pre-inflated anterior air cell and 2 adjustable Duplex air cells located at the malleoli that can be individually inflated for a total contact fit and secure support. It provides the protection and stability necessary for a healthy recovery.