SET Active to Spanx leggings size

The short answer

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

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 Spanx. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Spanx, by chart	Same label	Spanx builds it for	Spanx also prints
XS	waist 22 to 24 in	XS	XS	waist 25 to 27 in, hip 34 to 36 in	US numeric 0-2
S	waist 25 to 27 in	XS	S	waist 25 to 27 in, hip 34 to 36 in	US numeric 0-2
M	waist 28 to 30 in	S	M	waist 27 to 29 in, hip 36 to 38 in	US numeric 4-6
L	waist 31 to 33 in	L	L	waist 31 to 33.5 in, hip 40 to 42.5 in	US numeric 12-14
XL	waist 34 to 36 in	XL	XL	waist 33.5 to 36 in, hip 42.5 to 45 in	US numeric 16
XXL	waist 37 to 40 in	1X	not published	waist 36 to 39 in, hip 45 to 48 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.
Spanx size guide, read on 2026-09-18. Spanx on TrueToSize

Spanx to SET Active