SET Active to Sweaty Betty leggings size

The short answer

SET Active XS is Sweaty Betty XXS by the two brands' own charts. 3 of 6 SET Active sizes land on a different label at Sweaty Betty.

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 Sweaty Betty. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Sweaty Betty, by chart	Same label	Sweaty Betty builds it for	Sweaty Betty also prints
XS	waist 22 to 24 in	XXS	XS	waist 23 in, hip 34 in	US numeric 2
S	waist 25 to 27 in	XS or S	S	waist 25 in, hip 36 in	US numeric 4
M	waist 28 to 30 in	M	M	waist 29 in, hip 40 in	US numeric 8
L	waist 31 to 33 in	L or XL	L	waist 31 in, hip 42 in	US numeric 10
XL	waist 34 to 36 in	XXL	XL	waist 36 in, hip 46.5 in	US numeric 14
XXL	waist 37 to 40 in	XXL	XXL	waist 36 in, hip 46.5 in	US numeric 14

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.
Sweaty Betty size guide, read on 2026-09-17. Sweaty Betty on TrueToSize

Sweaty Betty to SET Active