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Gymshark to Nike leggings size

The short answer

Gymshark XXS is Nike XS by the two brands' own charts. 3 of 7 Gymshark 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 Gymshark size read across to Nike. Letter sizes on the left, Letter on the right.
GymsharkGymshark builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 24 in, hip 35.5 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 26 in, hip 37.5 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 28 in, hip 39.5 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 30 in, hip 41.5 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 32 in, hip 43.5 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 34 in, hip 45.5 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XXLwaist 36 in, hip 47.7 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 Gymshark