POPFLEX to SET Active leggings size

The short answer

POPFLEX XXS is SET Active XS by the two brands' own charts. 3 of 7 POPFLEX 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 POPFLEX size read across to SET Active. Letter sizes on the left, Letter on the right.
POPFLEX	POPFLEX builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XXS	waist 22 to 24 in, hip 32 to 34 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 24 to 26 in, hip 34 to 36 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 26 to 28 in, hip 36 to 38 in	S	S	waist 25 to 27 in	US numeric 4-6
M	waist 28 to 31 in, hip 38 to 40 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 31 to 34 in, hip 40 to 43 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 34 to 38 in, hip 43 to 47 in	XL	XL	waist 34 to 36 in	US numeric 16-18
1X	waist 38 to 42 in, hip 48 to 52 in	XXL	not published	waist 37 to 40 in	US numeric 20-22
2X	waist 42 to 46 in, hip 52 to 56 in	not made	not published	not published	not published
3X	waist 46 to 50 in, hip 56 to 60 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 2 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

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

SET Active to POPFLEX