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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.

Every POPFLEX size read across to Nike. Letter sizes on the left, Letter on the right.
POPFLEXPOPFLEX builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inUS numeric 0
XSwaist 24 to 26 in, hip 34 to 36 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 38 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 28 to 31 in, hip 38 to 40 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31 to 34 in, hip 40 to 43 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 34 to 38 in, hip 43 to 47 inXLXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
1Xwaist 38 to 42 in, hip 48 to 52 inXXL1Xwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
2Xwaist 42 to 46 in, hip 52 to 56 in1X2Xwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
3Xwaist 46 to 50 in, hip 56 to 60 in2X3Xwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

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.

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Sources

Nike to POPFLEX