Lululemon to Halara leggings size

The short answer

lululemon 4 is Halara XXS 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 lululemon size read across to Halara UltraSculpt. US numeric sizes on the left, Letter on the right.
lululemon	lululemon builds it for	Halara UltraSculpt, by chart	Same label	Halara builds it for	Halara also prints
0	waist 21 in, hip 32 in	not made	not published	not published	not published
2	waist 23 in, hip 33 in	not made	XXS	not published	not published
4	waist 25 in, hip 35 in	XXS	XS	waist 24 to 25 in, hip 33.5 to 34.5 in	not published
6	waist 27 in, hip 37 in	S	S	waist 27 to 28 in, hip 36.5 to 37.5 in	not published
8	waist 29 in, hip 39 in	M	M	waist 28.5 to 30.5 in, hip 38 to 40 in	not published
10	waist 31 in, hip 41 in	L	L	waist 31 to 33.5 in, hip 40.5 to 43 in	not published
12	waist 33 in, hip 43 in	L	XL	waist 31 to 33.5 in, hip 40.5 to 43 in	not published
14	waist 35 in, hip 45 in	XL	not published	waist 34 to 36.5 in, hip 43.5 to 46 in	not published
16	waist 38 in, hip 47 in	XL	not published	waist 34 to 36.5 in, hip 43.5 to 46 in	not published
18	waist 41 in, hip 49 in	not made	not published	not published	not published
20	waist 43 in, hip 51 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Halara 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.

Open in the converter Add an item you own

Sources

lululemon size guide, read on 2026-09-17. lululemon on TrueToSize
Halara UltraSculpt size guide, read on 2026-09-18. Halara on TrueToSize

Halara to lululemon