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Nike to Aerie (OFFLINE) leggings size

The short answer

Nike M is Aerie (OFFLINE) M or L by the two brands' own charts. 0 of 7 Nike sizes land on a different label at Aerie (OFFLINE).

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 Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
NikeNike builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXXSXXSwaist 22.5 to 23.5 in, hip 32 to 33 inUS numeric 000-00
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXSXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inM or LMwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inL or XLLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXL or XXLXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
XXLwaist 38.5 to 42.5 in, hip 47 to 50 inXXLXXLwaist 38 in, hip 47.5 inUS numeric 20
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. 5 sizes have no counterpart on the Aerie (OFFLINE) 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

Aerie (OFFLINE) to Nike