Birkenstock Arizona Suede Soft Footbed – Sole Mates
Not sure if it's easy to tell but one of my Birks is a completely different colour to the other pair.. the right one is more orangey & textured whereas the left
Birkenstock FAQs and Our Time-Tested Answers – Happy Feet Plus – Footwear For a Healthier You
Birkenstock Original Sole and Footbed Replacement – Cobblers Plus
Birkenstock Boston Soft Footbed (Unisex) | Zappos.com