SET Active to Decathlon leggings size

The short answer

SET Active XS is Decathlon 2XS by the two brands' own charts. 3 of 6 SET Active 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 SET Active size read across to Decathlon. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Decathlon, by chart	Same label	Decathlon builds it for	Decathlon also prints
XS	waist 22 to 24 in	2XS	XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	not published
S	waist 25 to 27 in	XS	S	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	not published
M	waist 28 to 30 in	M	M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	not published
L	waist 31 to 33 in	L	L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	not published
XL	waist 34 to 36 in	XL	XL	waist 34.3 to 36.6 in, hip 42.5 to 44.9 in	not published
XXL	waist 37 to 40 in	2XL	2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 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.

Open in the converter Add an item you own

Sources

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

Decathlon to SET Active