SET Active to Smartwool leggings size

The short answer

SET Active M is Smartwool S by the two brands' own charts. 4 of 4 SET Active sizes land on a different label at Smartwool.

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 Smartwool. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Smartwool, by chart	Same label	Smartwool builds it for	Smartwool also prints
XS	waist 22 to 24 in	not made	not published	not published	not published
S	waist 25 to 27 in	not made	S	not published	not published
M	waist 28 to 30 in	S	M	waist 29 to 31 in, hip 36 to 38 in	not published
L	waist 31 to 33 in	M	L	waist 32 to 34 in, hip 39 to 41 in	not published
XL	waist 34 to 36 in	L	XL	waist 35 to 37 in, hip 42 to 44 in	not published
XXL	waist 37 to 40 in	XL	XXL	waist 38 to 40 in, hip 45 to 48 in	not published

Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Smartwool chart. 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.
Smartwool size guide, read on 2026-09-18.

Smartwool to SET Active