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Nike to Gymshark size

The short answer

Nike S is Gymshark XS by the two brands' own charts. 4 of 5 Nike sizes land on a different label at Gymshark.

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

Every Nike size read across to Gymshark. Letter sizes on the left, Letter on the right.
NikeNike builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSchest 28.1 to 31.5 in, waist 22.5 to 25.5 in, hip 28.5 to 31.5 innot madenot publishednot publishednot published
XSchest 31.5 to 35 in, waist 25.5 to 29 in, hip 31.5 to 35 innot madeXSnot publishednot published
Schest 35 to 37.5 in, waist 29 to 32 in, hip 35 to 37.5 inXSSchest 37 in, waist 29.5 innot published
Mchest 37.5 to 41 in, waist 32 to 35 in, hip 37.5 to 41 inSMchest 39 in, waist 31.5 innot published
Lchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 inLLchest 43 in, waist 35.5 innot published
XLchest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 inXXL or XLXLchest 47 in, waist 39.5 innot published
XXLchest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 inXXXLXXLchest 49 in, waist 41.5 innot published
3XLchest 53.5 to 58 in, waist 47.5 to 52.5 in, hip 50.5 to 53.5 innot madeXXXLnot publishednot published
4XLchest 58 to 63 in, waist 52.5 to 57 in, hip 53.5 to 58.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Gymshark chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Gymshark to Nike