Size Guide
Every shoe on FlexX is listed in UK sizes — the same convention Amazon India uses for footwear. A UK 9 here is a UK 9 there.
The rule
For men's and unisex ASICS, UK = US − 1. For women's, UK = US − 2. Applying the men's rule to a women's shoe puts you a full size out.
Men's & unisex
| UK | US (men's) | EU | CM |
|---|---|---|---|
| 3 | 4 | 36 | 22.5 |
| 4 | 5 | 37.5 | 23.5 |
| 5 | 6 | 39 | 24.5 |
| 6 | 7 | 40 | 25.25 |
| 7 | 8 | 41.5 | 26 |
| 8 | 9 | 42.5 | 27 |
| 9 | 10 | 44 | 28 |
| 10 | 11 | 45 | 28.5 |
| 11 | 12 | 46.5 | 29.5 |
| 12 | 13 | 48 | 30.5 |
| 13 | 14 | 49 | 31 |
Women's
Women's ASICS style codes generally begin 1012. The gap from US is two sizes, not one.
| UK | US (women's) | EU | CM |
|---|---|---|---|
| 3 | 5 | 36 | 22.3 |
| 4 | 6 | 37 | 23.2 |
| 5 | 7 | 38 | 24.1 |
| 6 | 8 | 39 | 25.0 |
| 7 | 9 | 40 | 25.9 |
| 8 | 10 | 41 | 26.9 |
| 9 | 11 | 42 | 27.8 |
| 10 | 12 | 43 | 28.7 |
Measure your foot
- Stand on paper with your heel against a wall, late in the day when feet are largest.
- Mark the tip of your longest toe — not always the big toe.
- Measure heel to mark in centimetres. Do both feet and buy for the larger.
- Add 0.5–1.0cm for running and cricket.
- Match the total to the CM column above.
Fit by sport
Cricket
Shop →Cut narrow for lateral stability through the delivery stride. If you bowl and sit between sizes, take the larger one — your foot slides forward on landing. For fielding rubbers worn all day, prioritise width and comfort.
Running
Shop →True to size. Add 0.5–1.0cm of toe room; feet swell over distance and a shoe that fits perfectly at rest will be tight at 8km. Snug through the midfoot, never tight across the toes.
Tennis
Shop →Take your true size. Court shoes need lockdown for lateral movement — a half size up feels comfortable standing still and lets your foot slide on a hard change of direction.
Badminton
Shop →True to size, snug. Indoor court shoes are built for quick stops and lunges; any slack inside the shoe becomes a blister.
Padel & Pickleball
Shop →True to size. Same lockdown logic as tennis, with a reinforced toe for drag.
Before you order
We do not accept returns or exchanges for sizing, so it is worth being certain. If you are between sizes or unsure about a specific model, message us and we will check that shoe and answer honestly. We would rather answer a question than ship a pair you cannot wear.