SET Active to Athleta leggings size

The short answer

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

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 Athleta. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Athleta, by chart	Same label	Athleta builds it for	Athleta also prints
XS	waist 22 to 24 in	XXS	XS	waist 24.3 in, hip 34 in	US numeric 00
S	waist 25 to 27 in	XS	S	waist 25.3 to 26.3 in, hip 35 to 36 in	US numeric 0-2
M	waist 28 to 30 in	M	M	waist 29.3 to 30.3 in, hip 39 to 40 in	US numeric 8-10
L	waist 31 to 33 in	L	L	waist 31.8 to 33.3 in, hip 41.5 to 43 in	US numeric 12-14
XL	waist 34 to 36 in	XL	XL	waist 34.3 in, hip 44.5 in	US numeric 16-18
XXL	waist 37 to 40 in	1X	not published	waist 38 to 40 in, hip 47.3 to 49.3 in	US numeric 16W-18W

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.
Athleta size guide, read on 2026-09-17. Athleta on TrueToSize

Athleta to SET Active