Decathlon to adidas leggings size

The short answer

Decathlon 2XS is adidas XS by the two brands' own charts. 1 of 7 Decathlon sizes land on a different label at adidas.

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 adidas. Letter sizes on the left, Letter on the right.
Decathlon	Decathlon builds it for	adidas, by chart	Same label	adidas builds it for	adidas also prints
2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	XS	2XS	waist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 in	US numeric 0-2
XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	XS	XS	waist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 in	US numeric 0-2
S	waist 27.2 to 28.7 in, hip 35.4 to 37.8 in	S	S	waist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 in	US numeric 4-6
M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	M	M	waist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 in	US numeric 8-10
L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	L	L	waist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 in	US numeric 12-14
XL	waist 34.3 to 36.6 in, hip 42.5 to 44.9 in	XL	XL	waist 34 to 37 in, hip 43.5 to 46 in, inseam 31.5 in	US numeric 16-18
2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 in	2XL	2XL	waist 37.5 to 41 in, hip 46.5 to 49 in, inseam 32 in	US numeric 20

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

Decathlon size guide, read on 2026-09-18.
adidas size guide, read on 2026-09-18. adidas on TrueToSize

adidas to Decathlon