SET Active to Gymshark leggings size

The short answer

SET Active XS is Gymshark XXS by the two brands' own charts. 3 of 6 SET Active sizes land on a different label at Gymshark.

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

Every SET Active size read across to Gymshark. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Gymshark, by chart	Same label	Gymshark builds it for	Gymshark also prints
XS	waist 22 to 24 in	XXS	XS	waist 24 in, hip 35.5 in	US numeric 2-4
S	waist 25 to 27 in	XS	S	waist 26 in, hip 37.5 in	US numeric 4-6
M	waist 28 to 30 in	S or M	M	waist 28 in, hip 39.5 in	US numeric 6-8
L	waist 31 to 33 in	L	L	waist 32 in, hip 43.5 in	US numeric 10-12
XL	waist 34 to 36 in	XL or XXL	XL	waist 34 in, hip 45.5 in	US numeric 12-14
XXL	waist 37 to 40 in	XXL	XXL	waist 36 in, hip 47.7 in	US numeric 14-16

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

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

Gymshark to SET Active