Gymshark to SET Active leggings size

The short answer

Gymshark XXS is SET Active XS by the two brands' own charts. 4 of 7 Gymshark sizes land on a different label at SET Active.

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 SET Active. Letter sizes on the left, Letter on the right.
Gymshark	Gymshark builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XXS	waist 24 in, hip 35.5 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 26 in, hip 37.5 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 28 in, hip 39.5 in	M	S	waist 28 to 30 in	US numeric 8-10
M	waist 30 in, hip 41.5 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 32 in, hip 43.5 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 34 in, hip 45.5 in	XL	XL	waist 34 to 36 in	US numeric 16-18
XXL	waist 36 in, hip 47.7 in	XL	XXL	waist 34 to 36 in	US 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

Gymshark size guide, read on 2026-09-17. Gymshark on TrueToSize
SET Active size guide, read on 2026-09-18.

SET Active to Gymshark