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Sweaty Betty to Nike leggings size

The short answer

Sweaty Betty L is Nike M by the two brands' own charts. 3 of 7 Sweaty Betty sizes land on a different label at Nike.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Sweaty Betty size read across to Nike. Letter sizes on the left, Letter on the right.
Sweaty BettySweaty Betty builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 23 in, hip 34 inXXSXXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inUS numeric 0
XSwaist 25 in, hip 36 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 27 in, hip 38 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29 in, hip 40 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31 in, hip 42 inMLwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
XLwaist 33 in, hip 44 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XXLwaist 36 in, hip 46.5 inXLXXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
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

Nike to Sweaty Betty