SET Active to lululemon leggings size

The short answer

SET Active XS is lululemon 2 by the two brands' own charts.

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 lululemon. Letter sizes on the left, US numeric on the right.
SET Active	SET Active builds it for	lululemon, by chart	Same label	lululemon builds it for	lululemon also prints
XS	waist 22 to 24 in	2	not published	waist 23 in, hip 33 in	Letter XXS
S	waist 25 to 27 in	4 or 6	not published	waist 25 in, hip 35 in	Letter XS
M	waist 28 to 30 in	8	not published	waist 29 in, hip 39 in	Letter M
L	waist 31 to 33 in	10 or 12	not published	waist 31 in, hip 41 in	Letter L
XL	waist 34 to 36 in	14	not published	waist 35 in, hip 45 in	Letter XXL
XXL	waist 37 to 40 in	16	not published	waist 38 in, hip 47 in	not published

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.

Open in the converter Add an item you own

Sources

SET Active size guide, read on 2026-09-18.
lululemon size guide, read on 2026-09-17. lululemon on TrueToSize

lululemon to SET Active