We tried on a selection of Forma boots here in the office and found the length to be about right. The width on the boots is a touch more wide than most other brands we carry. Alpinestars and TCX tend to be the most wide, but these might even be a touch wider. I’d say they are a D to E and might even work for somebody with a slightly wider foot (but don’t get carried away and think they are wide enough for a person needing a EEE or wider). So my advice would be to use the chart below to choose a size based upon your US shoe size.
Forma offers advice on choosing a size from your foot measurement. Here’s how:
1) Measure the overall length of your foot. Forma recommends placing your heel against a wall and measuring from the wall to the end of your longest toe.
2) Add 3/4” to the length of your foot
3) Using Forma’s sizing chart below, choose the smallest size boot with an insole measurement that is at least the length of your foot plus 3/4”.
Use Forma’s size selection method as a “second opinion”. Maybe you’ll find it reassuring if it matches your size choice based on street shoe size or, maybe it could be a tie breaker if you are undecided between two sizes. FWIW, Forma’s advice didn’t work for me since I have relatively short toes. I wear a 45 (known from trying on) and this method put me in a 42.
Men’s Conversion Chart
| Size | US Conversion from Forma |
Internal Insole Measurement |
|---|---|---|
| 41 | 7 | 10.63” (270mm) |
| 42 | 8 | 11.02” (280mm) |
| 43 | 9 | 11.22” (285mm) |
| 44 | 10 | 11.42” (290mm) |
| 45 | 11 | 11.81” (300mm) |
| 46 | 12 | 12” (305mm) |
| 47 | 13 | 12.2” (310mm) |
| 48 | 14 | 12.4” (315mm) |
| 49 | 15 | 12.6” (320mm) |
Women’s Conversion Chart
| Size | Women’s US Conversion from Forma |
Internal Insole Measurement |
|---|---|---|
| 35 | 4 | 9.45” (240mm) |
| 36 | 5 | 9.64” (245mm) |
| 37 | 6 | 9.84” (250mm) |
| 38 | 7 | 10.04” (255mm) |
| 39 | 8 | 10.23” (260mm) |
| 40 | 9 | 10.43” (265mm) |
| 41 | 10 | 10.63” (270mm) |
| 42 | 11 | 11.02” (280mm) |