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2XU to Under Armour leggings size

The short answer

2XU XS is Under Armour XXS by the two brands' own charts. 5 of 6 2XU 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.

Every 2XU Flex & Fluid Tights size read across to Under Armour. Letter sizes on the left, Letter on the right.
2XU Flex & Fluid Tights2XU builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 23 to 24.5 in, hip 33 to 34.5 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 25 to 26 in, hip 35 to 36.5 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 26.5 to 28 in, hip 37 to 38.5 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 28.5 to 30 in, hip 39 to 40.5 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 30.5 to 32 in, hip 41 to 42.5 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 32.5 to 34 in, hip 43 to 44.5 inLGXLwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
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

Under Armour to 2XU