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Under Armour to Sweaty Betty leggings size

The short answer

Under Armour XXS is Sweaty Betty XS by the two brands' own charts. 6 of 7 Under Armour sizes land on a different label at Sweaty Betty.

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 Sweaty Betty. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXSXXSwaist 25 in, hip 36 inUS numeric 4
XSwaist 25.5 to 27 in, hip 34.5 to 36 inS or XSXSwaist 27 in, hip 38 inUS numeric 6
SMwaist 27 to 29 in, hip 36 to 38 inS or Mnot publishedwaist 27 in, hip 38 inUS numeric 6
MDwaist 29 to 31 in, hip 38 to 40 inM or Lnot publishedwaist 29 in, hip 40 inUS numeric 8
LGwaist 31 to 34 in, hip 40 to 43 inXLnot publishedwaist 33 in, hip 44 inUS numeric 12
XLwaist 34 to 37 in, hip 43 to 46 inXXLXLwaist 36 in, hip 46.5 inUS numeric 14
XXLwaist 37 to 40 in, hip 46 to 49 inXXLXXLwaist 36 in, hip 46.5 inUS numeric 14
3XLwaist 40 to 43 in, hip 49 to 52 innot madenot publishednot publishednot published
1Xwaist 39 to 43.5 in, hip 47 to 50.5 innot madenot publishednot publishednot published
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 innot madenot publishednot publishednot published
3Xwaist 48.5 to 53 in, hip 54.5 to 58 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Sweaty Betty 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

Sweaty Betty to Under Armour