Sof Sole Airr Insole Women's US 8- 11 Sof Sole(R) began in 1991 and has grown to become a worldwide leader in athletic footwear accessories. The technologically advanced designs and materials optimize the functionality, comfort, and feel of athletic and casual shoes. The Sof Sole Airr insole is the first to combine an air cushioning system with moisture control technology. It is designed to reduce impact from sharp cuts and hard landings. The air capsules in the heel and arch absorb shock with each step. The Airr Insole features forefoot gel cushions to provide shock absorption, and the air capsules in the heel and arch convert impact into kinetic energy. The top of the innersole is treated with Silvadur technology to inhibit odour causing bacteria. Simply put, the Sof Sole Airr is the best performance insole available. For all arch types. (Low, Medium, High)