Smartwool to Sweaty Betty leggings size
The short answer
Smartwool S is Sweaty Betty M or L by the two brands' own charts. 3 of 3 Smartwool sizes land on a different label at Sweaty Betty.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
On 2 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.
| Smartwool | Smartwool builds it for | Sweaty Betty, by chart | Same label | Sweaty Betty builds it for | Sweaty Betty also prints |
|---|---|---|---|---|---|
| S | waist 29 to 31 in, hip 36 to 38 in | M or L | S | waist 29 in, hip 40 in | US numeric 8 |
| M | waist 32 to 34 in, hip 39 to 41 in | XL | M | waist 33 in, hip 44 in | US numeric 12 |
| L | waist 35 to 37 in, hip 42 to 44 in | XXL | L | waist 36 in, hip 46.5 in | US numeric 14 |
| XL | waist 38 to 40 in, hip 45 to 48 in | not made | XL | not published | not published |
| XXL | waist 41 to 44 in, hip 49 to 51 in | not made | XXL | not published | 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
- Smartwool size guide, read on 2026-09-18.
- Sweaty Betty size guide, read on 2026-09-17. Sweaty Betty on TrueToSize