The Billie Women's Ballet flat has an elastic strap on the instep providing additional support. This lightweight ballet flat is characterised by an extremely flexible sole, which supports the foot’s natural rolling motion. The SOFT-AIR midsole, flexible and soft, reduces the shock from walking to an absolute minimum. This protects your feet, joints and vertebrae, while maintaining proper hygiene. For a comfortable and effortless walk. Maximum heel protection is achieved by the SHOCK ABSORBER. The removable footbed can be replaced with your personal custom orthotics.