Sweaty Betty to SET Active leggings size

The short answer

Sweaty Betty XXS is SET Active XS by the two brands' own charts. 4 of 7 Sweaty Betty 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 Sweaty Betty size read across to SET Active. Letter sizes on the left, Letter on the right.
Sweaty Betty	Sweaty Betty builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XXS	waist 23 in, hip 34 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 25 in, hip 36 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 27 in, hip 38 in	S	S	waist 25 to 27 in	US numeric 4-6
M	waist 29 in, hip 40 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 31 in, hip 42 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 33 in, hip 44 in	L	XL	waist 31 to 33 in	US numeric 12-14
XXL	waist 36 in, hip 46.5 in	XL	XXL	waist 34 to 36 in	US numeric 16-18

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

Sweaty Betty size guide, read on 2026-09-17. Sweaty Betty on TrueToSize
SET Active size guide, read on 2026-09-18.

SET Active to Sweaty Betty