Onzie to SET Active leggings size

The short answer

Onzie X/S is SET Active S by the two brands' own charts. 5 of 6 Onzie 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 Onzie size read across to SET Active. Letter sizes on the left, Letter on the right.
Onzie	Onzie builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
X/S	waist 24 to 26 in, hip 33 to 35 in	S	not published	waist 25 to 27 in	US numeric 4-6
S/M	waist 26 to 28 in, hip 36 to 38 in	S	not published	waist 25 to 27 in	US numeric 4-6
M/L	waist 28 to 31 in, hip 38 to 40 in	M	not published	waist 28 to 30 in	US numeric 8-10
L/L	waist 31 to 33 in, hip 40 to 42 in	L	not published	waist 31 to 33 in	US numeric 12-14
XL	waist 34 to 37 in, hip 43 to 45 in	XL	XL	waist 34 to 36 in	US numeric 16-18
1X	waist 38 to 40 in, hip 46 to 48 in	XXL	not published	waist 37 to 40 in	US numeric 20-22

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

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

SET Active to Onzie