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Nike to SET Active leggings size

The short answer

Nike XXS is SET Active XS by the two brands' own charts. 3 of 8 Nike 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 Nike size read across to SET Active. Letter sizes on the left, Letter on the right.
NikeNike builds it forSET Active, by chartSame labelSET Active builds it forSET Active also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXSnot publishedwaist 22 to 24 inUS numeric 00-4
XSwaist 23.5 to 26 in, hip 33 to 35.5 inSXSwaist 25 to 27 inUS numeric 4-6
Swaist 26 to 29 in, hip 35.5 to 38.5 inS or MSwaist 25 to 27 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 28 to 30 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 31 to 33 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXL or XXLXLwaist 34 to 36 inUS numeric 16-18
XXLwaist 38.5 to 42.5 in, hip 47 to 50 inXXLXXLwaist 37 to 40 inUS numeric 20-22
0Xwaist 40 to 43 in, hip 48 to 51 inXXLnot publishedwaist 37 to 40 inUS numeric 20-22
1Xwaist 43 to 45.5 in, hip 51 to 54 innot madenot publishednot publishednot published
2Xwaist 45.5 to 49 in, hip 54 to 57 innot madenot publishednot publishednot published
3Xwaist 49 to 53 in, hip 57 to 61 innot madenot publishednot publishednot published
4Xwaist 53 to 57 in, hip 61 to 65 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 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 Nike