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POPFLEX to Gymshark leggings size

The short answer

POPFLEX XS is Gymshark XXS or XS by the two brands' own charts. 3 of 6 POPFLEX sizes land on a different label at Gymshark.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every POPFLEX size read across to Gymshark. Letter sizes on the left, Letter on the right.
POPFLEXPOPFLEX builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 24 to 26 in, hip 34 to 36 inXXS or XSXSwaist 24 in, hip 35.5 inUS numeric 2-4
Swaist 26 to 28 in, hip 36 to 38 inXS or SSwaist 26 in, hip 37.5 inUS numeric 4-6
Mwaist 28 to 31 in, hip 38 to 40 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 31 to 34 in, hip 40 to 43 inLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 34 to 38 in, hip 43 to 47 inXXLXLwaist 36 in, hip 47.7 inUS numeric 14-16
1Xwaist 38 to 42 in, hip 48 to 52 innot madenot publishednot publishednot published
2Xwaist 42 to 46 in, hip 52 to 56 innot madenot publishednot publishednot published
3Xwaist 46 to 50 in, hip 56 to 60 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Gymshark chart. 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

Gymshark to POPFLEX