Aerie (OFFLINE) to Under Armour leggings size
The short answer
Aerie (OFFLINE) XS is Under Armour XXS by the two brands' own charts. 4 of 6 Aerie (OFFLINE) sizes land on a different label at Under Armour.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
| Aerie (OFFLINE) | Aerie (OFFLINE) builds it for | Under Armour, by chart | Same label | Under Armour builds it for | Under Armour also prints |
|---|---|---|---|---|---|
| XXS | waist 22.5 to 23.5 in, hip 32 to 33 in | not made | XXS | not published | not published |
| XS | waist 24.5 to 25.5 in, hip 34 to 35 in | XXS | XS | waist 24.5 to 25.5 in, hip 33 to 34.5 in | US numeric 00 |
| S | waist 26.5 to 27.5 in, hip 36 to 37 in | XS | not published | waist 25.5 to 27 in, hip 34.5 to 36 in | US numeric 0-2 |
| M | waist 28.5 to 29.5 in, hip 38 to 39 in | SM | not published | waist 27 to 29 in, hip 36 to 38 in | US numeric 4-6 |
| L | waist 31 to 32.5 in, hip 40.5 to 42 in | LG | not published | waist 31 to 34 in, hip 40 to 43 in | US numeric 12-14 |
| XL | waist 34 to 36 in, hip 43.5 to 45.5 in | XL | XL | waist 34 to 37 in, hip 43 to 46 in | US numeric 16 |
| XXL | waist 38 in, hip 47.5 in | XXL | XXL | waist 37 to 40 in, hip 46 to 49 in | US numeric 18 |
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
- Aerie (OFFLINE) size guide, read on 2026-09-18. Aerie (OFFLINE) on TrueToSize
- Under Armour size guide, read on 2026-09-17. Under Armour on TrueToSize