Smartwool to Decathlon leggings size
The short answer
Smartwool S is Decathlon M by the two brands' own charts. 4 of 4 Smartwool sizes land on a different label at Decathlon.
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 | Decathlon, by chart | Same label | Decathlon builds it for | Decathlon also prints |
|---|---|---|---|---|---|
| S | waist 29 to 31 in, hip 36 to 38 in | M | S | waist 29.1 to 31.1 in, hip 37.8 to 40.2 in | not published |
| M | waist 32 to 34 in, hip 39 to 41 in | L | M | waist 31.5 to 33.9 in, hip 40.2 to 42.5 in | not published |
| L | waist 35 to 37 in, hip 42 to 44 in | XL | L | waist 34.3 to 36.6 in, hip 42.5 to 44.9 in | not published |
| XL | waist 38 to 40 in, hip 45 to 48 in | 2XL | XL | waist 37 to 39.4 in, hip 44.9 to 47.2 in | not published |
| XXL | waist 41 to 44 in, hip 49 to 51 in | not made | 2XL | 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.
- Decathlon size guide, read on 2026-09-18.