Uniqlo to SET Active leggings size

The short answer

Uniqlo XXS is SET Active XS by the two brands' own charts. 4 of 7 Uniqlo 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 Uniqlo size read across to SET Active. Letter sizes on the left, Letter on the right.
Uniqlo	Uniqlo builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XXS	waist 22.5 to 24.8 in, hip 32.8 to 35 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 24 to 26.5 in, hip 34.3 to 36.5 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 25.5 to 28 in, hip 35.8 to 38.3 in	S	S	waist 25 to 27 in	US numeric 4-6
M	waist 27.3 to 29.5 in, hip 37.5 to 39.8 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 29.5 to 32 in, hip 39.8 to 42.3 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 32 to 34.3 in, hip 42.3 to 44.5 in	L	XL	waist 31 to 33 in	US numeric 12-14
XXL	waist 34.3 to 36.5 in, hip 44.5 to 46.8 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

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

SET Active to Uniqlo