POPFLEX to Under Armour leggings size
The short answer
POPFLEX XS is Under Armour XXS by the two brands' own charts. 5 of 9 POPFLEX 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.
| POPFLEX | POPFLEX builds it for | Under Armour, by chart | Same label | Under Armour builds it for | Under Armour also prints |
|---|---|---|---|---|---|
| XXS | waist 22 to 24 in, hip 32 to 34 in | XXS | XXS | waist 24.5 to 25.5 in, hip 33 to 34.5 in | US numeric 00 |
| XS | waist 24 to 26 in, hip 34 to 36 in | XXS | XS | waist 24.5 to 25.5 in, hip 33 to 34.5 in | US numeric 00 |
| S | waist 26 to 28 in, hip 36 to 38 in | XS | not published | waist 25.5 to 27 in, hip 34.5 to 36 in | US numeric 0-2 |
| M | waist 28 to 31 in, hip 38 to 40 in | MD | not published | waist 29 to 31 in, hip 38 to 40 in | US numeric 8-10 |
| L | waist 31 to 34 in, hip 40 to 43 in | LG | not published | waist 31 to 34 in, hip 40 to 43 in | US numeric 12-14 |
| XL | waist 34 to 38 in, hip 43 to 47 in | XL | XL | waist 34 to 37 in, hip 43 to 46 in | US numeric 16 |
| 1X | waist 38 to 42 in, hip 48 to 52 in | 1X | 1X | waist 39 to 43.5 in, hip 47 to 50.5 in | US numeric 16W-18W |
| 2X | waist 42 to 46 in, hip 52 to 56 in | 2X | 2X | waist 43.5 to 48.5 in, hip 50.5 to 54.5 in | US numeric 20W-22W |
| 3X | waist 46 to 50 in, hip 56 to 60 in | 2X | 3X | waist 43.5 to 48.5 in, hip 50.5 to 54.5 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
- POPFLEX size guide, read on 2026-09-18.
- Under Armour size guide, read on 2026-09-17. Under Armour on TrueToSize