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Nike to Sweaty Betty leggings size

The short answer

Nike M is Sweaty Betty L or M by the two brands' own charts. 3 of 6 Nike 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 Nike size read across to Sweaty Betty. Letter sizes on the left, Letter on the right.
NikeNike builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXXSXXSwaist 23 in, hip 34 inUS numeric 2
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXSXSwaist 25 in, hip 36 inUS numeric 4
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 27 in, hip 38 inUS numeric 6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inL or MMwaist 31 in, hip 42 inUS numeric 10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inXLLwaist 33 in, hip 44 inUS numeric 12
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXXLXLwaist 36 in, hip 46.5 inUS numeric 14
XXLwaist 38.5 to 42.5 in, hip 47 to 50 innot madeXXLnot publishednot published
0Xwaist 40 to 43 in, hip 48 to 51 innot madenot publishednot publishednot published
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. 6 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 Nike