Comfort InsoleComfort insoles feature Smartmask technology, a custom blended polyurethane foam with millions of tiny air bubbles, which cushion your every step and help to stabilize your heel and arch, while holding your foot in the correct anatomical position. It also features Agion antimicrobial treatment which inhibits the growth of bacteria. Size Guide Fits large. If you normally wear a half size, we recommend going down to the nearest size. For additional size