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Under Armour to POPFLEX leggings size

The short answer

Under Armour XXS is POPFLEX XS by the two brands' own charts. 7 of 11 Under Armour sizes land on a different label at POPFLEX.

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

Every Under Armour size read across to POPFLEX. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forPOPFLEX, by chartSame labelPOPFLEX builds it forPOPFLEX also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 24 to 26 in, hip 34 to 36 innot published
XSwaist 25.5 to 27 in, hip 34.5 to 36 inSXSwaist 26 to 28 in, hip 36 to 38 innot published
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 26 to 28 in, hip 36 to 38 innot published
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 28 to 31 in, hip 38 to 40 innot published
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31 to 34 in, hip 40 to 43 innot published
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 34 to 38 in, hip 43 to 47 innot published
XXLwaist 37 to 40 in, hip 46 to 49 in1Xnot publishedwaist 38 to 42 in, hip 48 to 52 innot published
3XLwaist 40 to 43 in, hip 49 to 52 in1Xnot publishedwaist 38 to 42 in, hip 48 to 52 innot published
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in1X1Xwaist 38 to 42 in, hip 48 to 52 innot published
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in2X2Xwaist 42 to 46 in, hip 52 to 56 innot published
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in3X3Xwaist 46 to 50 in, hip 56 to 60 innot published
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

POPFLEX to Under Armour