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Under Armour to SET Active leggings size

The short answer

Under Armour XXS is SET Active S by the two brands' own charts. 7 of 9 Under Armour sizes land on a different label at SET Active.

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 SET Active. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forSET Active, by chartSame labelSET Active builds it forSET Active also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inSnot publishedwaist 25 to 27 inUS numeric 4-6
XSwaist 25.5 to 27 in, hip 34.5 to 36 inSXSwaist 25 to 27 inUS numeric 4-6
SMwaist 27 to 29 in, hip 36 to 38 inMnot publishedwaist 28 to 30 inUS numeric 8-10
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 28 to 30 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 31 to 33 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 34 to 36 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 inXXLXXLwaist 37 to 40 inUS numeric 20-22
3XLwaist 40 to 43 in, hip 49 to 52 inXXLnot publishedwaist 37 to 40 inUS numeric 20-22
1Xwaist 39 to 43.5 in, hip 47 to 50.5 inXXLnot publishedwaist 37 to 40 inUS numeric 20-22
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. 2 sizes have no counterpart on the SET Active 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

SET Active to Under Armour