Mephisto Sano ERWIN: Smooth leather upper, stretch micro nylon, and two elastic bands hugs foot for a secure comfortable fit. Leather and textile lining helps feet stay cool and dry. Footbed is covered in leather with a thick latex cushioned insole for all-day comfort and support. Sano technology features a Multi Vibration System for energy return and a natural forward motion when walking. Durable 100% rubber out-sole provides perfect traction.