The Birko Flex is a moderate flange arch support. Waterproof, lightweight, and flexible, it’s perfect to wear anywhere. Made of washable EVA and features a deep heel cup and metatarsal support.
- Anatomically Shaped Footbed
- Best with sport shoes and work shoes
- Recommended for low to average arch feet
| EU | US | UK | mm |
|---|---|---|---|
| 35 | 4 – 4.5 | 2.5 | 225 |
| 36 | 5 – 5.5 | 3.5 | 230 |
| 37 | 6 – 6.5 | 4.5 | 240 |
| 38 | 7 – 7.5 | 5 | 245 |
| 39 | 8 – 8.5 | 5.5 | 250 |
| 40 | 9 – 9.5 | 7 | 260 |
| 41 | 10 – 10.5 | 7.5 | 265 |
| 42 | 11 – 11.5 | 8 | 270 |
| 43 | 12 – 12.5 | 9 | 280 |
| EU | US | UK | mm |
|---|---|---|---|
| 39 | 6 – 6.5 | 5.5 | 250 |
| 40 | 7 – 7.5 | 7 | 260 |
| 41 | 8 – 8.5 | 7.5 | 265 |
| 42 | 9 – 9.5 | 8 | 270 |
| 43 | 10 – 10.5 | 9 | 280 |
| 44 | 11 – 11.5 | 9.5 | 285 |
| 45 | 12 – 12.5 | 10.5 | 290 |
| 46 | 13 – 13.5 | 11.5 | 300 |
| 47 | 14 – 14.5 | 12 | 305 |
| 48 | 15 – 15.5 | 13 | 310 |
| 49 | 16 – 16.5 | 14 | 320 |
| 50 | 17 – 17.5 | 14.5 | 325 |
| EU | US | UK | mm |
|---|---|---|---|
| 24 | 6 – 6.5 | 7 | 150 |
| 25 | 7 – 7.5 | 8 | 160 |
| 26 | 8 – 8.5 | 8.5 | 165 |
| 27 | 9 – 9.5 | 9 | 170 |
| 28 | 10 – 10.5 | 10 | 180 |
| 29 | 11 – 11.5 | 11 | 185 |
| 30 | 12 – 12.5 | 11.5 | 190 |
| 31 | 13 – 13.5 | 13 | 200 |
| 32 | 1 – 1.5 | 13.5 | 205 |
| 33 | 2 – 2.5 | 1 | 210 |
| 34 | 3 – 3.5 | 2 | 220 |
| 35 | 4 – 4.5 | 2.5 | 225 |
| 36 | 5 – 5.5 | 3.5 | 230 |
| 37 | 6 – 6.5 | 4.5 | 240 |
| 38 | 7 – 7.5 | 5 | 245 |
| 39 | 8 – 8.5 | 5.5 | 250 |
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