R.M. Williams boots are sized by both length and width, so finding the right pair involves more than choosing your usual shoe number. Men’s R.M. Williams boots use AU/UK footwear sizing, with separate width fittings that allow you to fine-tune the fit across the foot.
This guide explains the sizing system used on men’s R.M. Williams boots, including the F, G, H and X width fittings, common UK, EU and US size conversions, and how to measure your feet before choosing a pair.
How does R.M. Williams boot sizing work?
R.M. Williams men’s boots are made using AU/UK sizing. For men’s boots, the AU/UK number is the same, while the equivalent US men’s size is generally one full size higher. European sizing uses a separate scale.
The table below covers the sizes most commonly represented in our current men’s boot range.
| AU/UK size | EU | US men’s | Foot length |
|---|---|---|---|
| 7 | 41 | 8 | 25.9 cm |
| 7½ | 41.5 | 8.5 | 26.3 cm |
| 8 | 42 | 9 | 26.8 cm |
| 8½ | 43 | 9.5 | 27.2 cm |
| 9 | 43.5 | 10 | 27.6 cm |
| 9½ | 44 | 10.5 | 28.0 cm |
| 10 | 45 | 11 | 28.4 cm |
| 10½ | 45.5 | 11.5 | 28.9 cm |
| 11 | 46 | 12 | 29.3 cm |
| 11½ | 46.5 | 12.5 | 29.7 cm |
| 12 | 47 | 13 | 30.1 cm |
These measurements are a starting point rather than a substitute for trying the boot on. Different toe shapes, leathers and constructions can change how a boot feels even when the marked size is the same.
What do F, G, H and X mean in R.M. Williams boots?
R.M. Williams uses letters to describe the width fitting of its men’s boots:
- F – Narrow
- G – Regular
- H – Wide
- X – Extra Wide
R.M. Williams states that adjacent width fittings within the same size vary by approximately 0.64 cm, or ¼ inch, in foot width. This is useful because a boot that is correct in length but too tight across the widest part of the foot may need a wider fitting rather than a longer size.
R.M. Williams G vs H width: what is the difference?
G is the regular fitting and H is the wide fitting. Within the same marked size, H provides more width than G. If the boot length feels right but the instep or ball of the foot feels too tight, moving from G to H can be more appropriate than choosing a longer boot.
If a G fitting feels neat without pressure, there is no reason to move wider. If a fitting is too loose, the foot can slide forward rather than being held securely through the instep.
Should I size up if an R.M. Williams boot feels tight?
Not automatically. First establish whether the problem is length or width. If your toes are short of space, the next half size may be appropriate. If the length feels right but the boot is restrictive across the widest part of the foot, a wider fitting may be the better solution.
R.M. Williams offers half sizes as well as width fittings, giving you two separate ways to refine fit. If your measurements fall between two sizes or fittings, the manufacturer recommends choosing the larger option.
How to measure your feet for R.M. Williams boots
- Wear the socks you normally wear with boots. Sock thickness affects the amount of room inside the boot.
- Measure foot length. Stand on a piece of paper and mark the back of the heel and the end of the big toe, then measure between those points.
- Measure around the widest part of the foot. Wrap a tape measure completely around the foot just below the toes.
- Measure both feet. It is common for one foot to be slightly larger than the other.
- Use the larger foot when choosing your size. If you fall between two sizes or width fittings, use the larger measurement as your starting point.
How should an R.M. Williams Chelsea boot fit?
R.M. Williams advises that a correctly fitted boot should feel comfortable from the outset rather than relying on a long break-in period. Check four areas:
- Ball of the foot: the big-toe joint should line up with the widest part of the boot so the foot and boot flex in the same place.
- Toe room: allow roughly a thumb’s width between the end of the toes and the end of the boot, with enough room for the little toe to sit comfortably.
- Instep and width: the top of the boot should feel neat and firm, not painfully tight. If the length is correct but the instep is too tight, look to a wider fitting rather than automatically increasing the length.
- Heel: a small amount of heel rise when walking is normal in a new pull-on boot and should reduce as the sole becomes more flexible.
Do not buy a pair that is obviously too small expecting the leather to stretch a full size. The upper leather may ease and mould with wear, but it should not be relied on to correct an incorrect size or width.
R.M. Williams Comfort Craftsman sizing
The R.M. Williams Comfort Craftsman Boot uses the same men’s AU/UK sizing and width-fitting system. When a product is available in more than one width, the product selector will show the fittings currently available.
You can browse our full R.M. Williams boots range, or compare the brand with another Australian pull-on option in our Blundstone vs R.M. Williams guide.
Looking after the fit once you have the right pair
Correct sizing is only part of keeping a pair of boots comfortable. Leather needs appropriate conditioning and polish to stay supple, while wet boots should be allowed to dry naturally rather than being placed against direct heat. See our shoe and boot care guide and shoe care collection for maintenance advice and products.
Size conversions, width definitions and measuring guidance are based on the current R.M. Williams UK men’s boot sizing guide. Available sizes and fittings vary by boot style.
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