2XU to Onzie leggings size

The short answer

2XU XXS is Onzie X/S by the two brands' own charts. 6 of 6 2XU sizes land on a different label at Onzie.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every 2XU Flex & Fluid Tights size read across to Onzie. Letter sizes on the left, Letter on the right.
2XU Flex & Fluid Tights	2XU builds it for	Onzie, by chart	Same label	Onzie builds it for	Onzie also prints
XXS	waist 23 to 24.5 in, hip 33 to 34.5 in	X/S	not published	waist 24 to 26 in, hip 33 to 35 in	US numeric 0-2
XS	waist 25 to 26 in, hip 35 to 36.5 in	X/S	not published	waist 24 to 26 in, hip 33 to 35 in	US numeric 0-2
S	waist 26.5 to 28 in, hip 37 to 38.5 in	S/M	X/S	waist 26 to 28 in, hip 36 to 38 in	US numeric 2-6
M	waist 28.5 to 30 in, hip 39 to 40.5 in	M/L	S/M	waist 28 to 31 in, hip 38 to 40 in	US numeric 6-8
L	waist 30.5 to 32 in, hip 41 to 42.5 in	L/L	M/L	waist 31 to 33 in, hip 40 to 42 in	US numeric 10-12
XL	waist 32.5 to 34 in, hip 43 to 44.5 in	L/L	XL	waist 31 to 33 in, hip 40 to 42 in	US numeric 10-12

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

2XU Flex & Fluid Tights size guide, read on 2026-09-18.
Onzie size guide, read on 2026-09-18.

Onzie to 2XU