Decathlon to SET Active leggings size

The short answer

Decathlon 2XS is SET Active XS by the two brands' own charts. 4 of 7 Decathlon sizes land on a different label at SET Active.

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 SET Active. Letter sizes on the left, Letter on the right.
Decathlon	Decathlon builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 27.2 to 28.7 in, hip 35.4 to 37.8 in	M	S	waist 28 to 30 in	US numeric 8-10
M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	L	L	waist 31 to 33 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 36 in	US numeric 16-18
2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 in	XXL	XXL	waist 37 to 40 in	US numeric 20-22

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

Decathlon size guide, read on 2026-09-18.
SET Active size guide, read on 2026-09-18.

SET Active to Decathlon