2XU to Decathlon leggings size

The short answer

2XU XXS is Decathlon 2XS by the two brands' own charts. 3 of 6 2XU sizes land on a different label at Decathlon.

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 Decathlon. Letter sizes on the left, Letter on the right.
2XU Flex & Fluid Tights	2XU builds it for	Decathlon, by chart	Same label	Decathlon builds it for	Decathlon also prints
XXS	waist 23 to 24.5 in, hip 33 to 34.5 in	2XS	2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	not published
XS	waist 25 to 26 in, hip 35 to 36.5 in	XS	XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	not published
S	waist 26.5 to 28 in, hip 37 to 38.5 in	S	S	waist 27.2 to 28.7 in, hip 35.4 to 37.8 in	not published
M	waist 28.5 to 30 in, hip 39 to 40.5 in	M	M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	not published
L	waist 30.5 to 32 in, hip 41 to 42.5 in	M	L	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	not published
XL	waist 32.5 to 34 in, hip 43 to 44.5 in	L	XL	waist 31.5 to 33.9 in, hip 40.2 to 42.5 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.

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Sources

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

Decathlon to 2XU