Fidelio is an Austrian producer of wide fitting mules, sandals and clogs for the comfort shoe market.The unique Hallux bunion sandal, which is now recommended by over 1000 healthcare professionals is described by Fidelio as a clever solution for feet with sensitive bunions. Hallux provides a proven solution to the common bunion foot problem. In addition to many other features, the sandals have a stretchable insert that significantly relieves pressure upon bunions.The Fidelio range is made from top quality materials that feature anatomically designed insoles which are anti-slip, shock absorbent, air cushioned. Removable insole.