Spanx to SET Active leggings size

The short answer

Spanx XS is SET Active S by the two brands' own charts. 4 of 7 Spanx 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 Spanx size read across to SET Active. Letter sizes on the left, Letter on the right.
Spanx	Spanx builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XS	waist 25 to 27 in, hip 34 to 36 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 27 to 29 in, hip 36 to 38 in	M	S	waist 28 to 30 in	US numeric 8-10
M	waist 29 to 31 in, hip 38 to 40 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 31 to 33.5 in, hip 40 to 42.5 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 33.5 to 36 in, hip 42.5 to 45 in	XL	XL	waist 34 to 36 in	US numeric 16-18
1X	waist 36 to 39 in, hip 45 to 48 in	XXL	not published	waist 37 to 40 in	US numeric 20-22
2X	waist 39 to 42 in, hip 48 to 51 in	XXL	not published	waist 37 to 40 in	US numeric 20-22
3X	waist 42 to 45 in, hip 51 to 54 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the SET Active chart. 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

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

SET Active to Spanx