POPFLEX to Nike leggings size
The short answer
POPFLEX 1X is Nike XXL by the two brands' own charts. 3 of 9 POPFLEX sizes land on a different label at Nike.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
On 1 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.
| POPFLEX | POPFLEX builds it for | Nike, by chart | Same label | Nike builds it for | Nike also prints |
|---|---|---|---|---|---|
| XXS | waist 22 to 24 in, hip 32 to 34 in | XXS | XXS | waist 21.3 to 23.5 in, hip 30.5 to 33 in | US numeric 0 |
| XS | waist 24 to 26 in, hip 34 to 36 in | XS | XS | waist 23.5 to 26 in, hip 33 to 35.5 in | US numeric 0-2 |
| S | waist 26 to 28 in, hip 36 to 38 in | S | S | waist 26 to 29 in, hip 35.5 to 38.5 in | US numeric 4-6 |
| M | waist 28 to 31 in, hip 38 to 40 in | M | M | waist 29 to 31.5 in, hip 38.5 to 41 in | US numeric 8-10 |
| L | waist 31 to 34 in, hip 40 to 43 in | L | L | waist 31.5 to 34.5 in, hip 41 to 44 in | US numeric 12-14 |
| XL | waist 34 to 38 in, hip 43 to 47 in | XL | XL | waist 34.5 to 38.5 in, hip 44 to 47 in | US numeric 16-18 |
| 1X | waist 38 to 42 in, hip 48 to 52 in | XXL | 1X | waist 38.5 to 42.5 in, hip 47 to 50 in | US numeric 20-22 |
| 2X | waist 42 to 46 in, hip 52 to 56 in | 1X | 2X | waist 43 to 45.5 in, hip 51 to 54 in | US numeric 18W-20W |
| 3X | waist 46 to 50 in, hip 56 to 60 in | 2X | 3X | waist 45.5 to 49 in, hip 54 to 57 in | US numeric 22W-24W |
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.
- Nike size guide, read on 2026-09-17. Nike on TrueToSize