Uniqlo to Smartwool leggings size
The short answer
Uniqlo M is Smartwool S by the two brands' own charts. 4 of 5 Uniqlo sizes land on a different label at Smartwool.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
On 3 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.
| Uniqlo | Uniqlo builds it for | Smartwool, by chart | Same label | Smartwool builds it for | Smartwool also prints |
|---|---|---|---|---|---|
| XXS | waist 22.5 to 24.8 in, hip 32.8 to 35 in | not made | not published | not published | not published |
| XS | waist 24 to 26.5 in, hip 34.3 to 36.5 in | not made | not published | not published | not published |
| S | waist 25.5 to 28 in, hip 35.8 to 38.3 in | S | S | waist 29 to 31 in, hip 36 to 38 in | not published |
| M | waist 27.3 to 29.5 in, hip 37.5 to 39.8 in | S | M | waist 29 to 31 in, hip 36 to 38 in | not published |
| L | waist 29.5 to 32 in, hip 39.8 to 42.3 in | S | L | waist 29 to 31 in, hip 36 to 38 in | not published |
| XL | waist 32 to 34.3 in, hip 42.3 to 44.5 in | M | XL | waist 32 to 34 in, hip 39 to 41 in | not published |
| XXL | waist 34.3 to 36.5 in, hip 44.5 to 46.8 in | L | XXL | waist 35 to 37 in, hip 42 to 44 in | not published |
What wearers say
Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.
Sources
- Uniqlo size guide, read on 2026-09-18. Uniqlo on TrueToSize
- Smartwool size guide, read on 2026-09-18.