SET Active to SKIMS leggings size

The short answer

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

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 SKIMS. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	SKIMS, by chart	Same label	SKIMS builds it for	SKIMS also prints
XS	waist 22 to 24 in	XXS	XS	waist 23 to 24 in, hip 31 to 34 in	US numeric 00
S	waist 25 to 27 in	XS	S	waist 24 to 26 in, hip 34 to 36.5 in	US numeric 0-2
M	waist 28 to 30 in	M	M	waist 29 to 31 in, hip 39.5 to 41.5 in	US numeric 8-10
L	waist 31 to 33 in	L	L	waist 31.5 to 34.5 in, hip 42 to 44 in	US numeric 12-14
XL	waist 34 to 36 in	XL	XL	waist 35 to 38 in, hip 44.5 to 47.5 in	US numeric 16
XXL	waist 37 to 40 in	2X	not published	waist 38.5 to 41.5 in, hip 48 to 51 in	US numeric 18-20

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

SKIMS to SET Active