Decathlon to 2XU leggings size

The short answer

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

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

Every Decathlon size read across to 2XU Flex & Fluid Tights. Letter sizes on the left, Letter on the right.
Decathlon	Decathlon builds it for	2XU Flex & Fluid Tights, by chart	Same label	2XU builds it for	2XU also prints
2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	XXS	XXS	waist 23 to 24.5 in, hip 33 to 34.5 in	not published
XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	XS	XS	waist 25 to 26 in, hip 35 to 36.5 in	not published
S	waist 27.2 to 28.7 in, hip 35.4 to 37.8 in	S	S	waist 26.5 to 28 in, hip 37 to 38.5 in	not published
M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	M	M	waist 28.5 to 30 in, hip 39 to 40.5 in	not published
L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	XL	L	waist 32.5 to 34 in, hip 43 to 44.5 in	not published
XL	waist 34.3 to 36.6 in, hip 42.5 to 44.9 in	XL	XL	waist 32.5 to 34 in, hip 43 to 44.5 in	not published
2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the 2XU 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.

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Sources

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

2XU to Decathlon