SET Active to Uniqlo leggings size

The short answer

SET Active XS is Uniqlo XXS by the two brands' own charts. 4 of 6 SET Active sizes land on a different label at Uniqlo.

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 Uniqlo. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Uniqlo, by chart	Same label	Uniqlo builds it for	Uniqlo also prints
XS	waist 22 to 24 in	XXS	XS	waist 22.5 to 24.8 in, hip 32.8 to 35 in	not published
S	waist 25 to 27 in	XS	S	waist 24 to 26.5 in, hip 34.3 to 36.5 in	not published
M	waist 28 to 30 in	M	M	waist 27.3 to 29.5 in, hip 37.5 to 39.8 in	not published
L	waist 31 to 33 in	XL	L	waist 32 to 34.3 in, hip 42.3 to 44.5 in	not published
XL	waist 34 to 36 in	XXL	XL	waist 34.3 to 36.5 in, hip 44.5 to 46.8 in	not published
XXL	waist 37 to 40 in	XXL	XXL	waist 34.3 to 36.5 in, hip 44.5 to 46.8 in	not published

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.
Uniqlo size guide, read on 2026-09-18. Uniqlo on TrueToSize

Uniqlo to SET Active