Smartwool to Athleta leggings size
The short answer
Smartwool S is Athleta M by the two brands' own charts. 5 of 5 Smartwool sizes land on a different label at Athleta.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
| Smartwool | Smartwool builds it for | Athleta, by chart | Same label | Athleta builds it for | Athleta also prints |
|---|---|---|---|---|---|
| S | waist 29 to 31 in, hip 36 to 38 in | M | S | waist 29.3 to 30.3 in, hip 39 to 40 in | US numeric 8-10 |
| M | waist 32 to 34 in, hip 39 to 41 in | L | M | waist 31.8 to 33.3 in, hip 41.5 to 43 in | US numeric 12-14 |
| L | waist 35 to 37 in, hip 42 to 44 in | XL or 1X | L | waist 34.3 in, hip 44.5 in | US numeric 16-18 |
| XL | waist 38 to 40 in, hip 45 to 48 in | 1X | XL | waist 38 to 40 in, hip 47.3 to 49.3 in | US numeric 16W-18W |
| XXL | waist 41 to 44 in, hip 49 to 51 in | 2X | not published | waist 42 to 44.5 in, hip 51.3 to 53.8 in | US numeric 20W-22W |
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.
- Athleta size guide, read on 2026-09-17. Athleta on TrueToSize