Comfortable Birkenstock insoles. Size 39. Any shoes will feel as comfortable as Birkenstocks, with a pleasant fit for your feet, making your body feel better. Used only a few times. I found them very useful, but I'm selling them to declutter. I purchased them at the Shinjuku Birkenstock store for about 4000 yen. - Brand: Birkenstock - Model Name: Das Blaue Fussbett Sport - Size: 39 (EU) / 5.5 (UK) / 8.0 (US) - Fit: Regular Fit Thank you for looking.