Size & Fit Fits women's shoe sizes 8-11 Product Features Air bag foam technology Coolmax fabric cover for breathable comfort Heel and arch cushioning pockets Fits underneath existing insole The Sof Sole Airr Insole is imported. The Sof Sole Airr Insole features revolutionary air bag technology with a Coolmax fabric cover. The heel and arch contain air cushioning pockets to make every step feel light and reduces the direct impact on your feet. Place underneath existing insole for proper fit.