Alphalete to SET Active leggings size

The short answer

Alphalete 2XS is SET Active XS by the two brands' own charts. 4 of 7 Alphalete 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 Alphalete size read across to SET Active. Letter sizes on the left, Letter on the right.
Alphalete	Alphalete builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
2XS	waist 23 to 24 in, hip 33 to 34 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 25 to 26 in, hip 35 to 36 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 27 to 28 in, hip 37 to 38 in	S or M	S	waist 25 to 27 in	US numeric 4-6
M	waist 29 to 30 in, hip 39 to 40 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 31 to 32 in, hip 41 to 42 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 33 to 34 in, hip 43 to 44 in	L or XL	XL	waist 31 to 33 in	US numeric 12-14
2XL	waist 35 to 36 in, hip 45 to 46 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

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

SET Active to Alphalete