Alo Yoga to Under Armour leggings size

The short answer

Alo Yoga S is Under Armour SM by the two brands' own charts. 4 of 7 Alo Yoga sizes land on a different label at Under Armour.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Alo Yoga size read across to Under Armour. Letter sizes on the left, Letter on the right.
Alo Yoga	Alo Yoga builds it for	Under Armour, by chart	Same label	Under Armour builds it for	Under Armour also prints
XXS	waist 23.4 to 24.4 in, hip 33.1 to 34.1 in	XXS	XXS	waist 24.5 to 25.5 in, hip 33 to 34.5 in	US numeric 00
XS	waist 25 to 26.6 in, hip 34.4 to 36 in	XS	XS	waist 25.5 to 27 in, hip 34.5 to 36 in	US numeric 0-2
S	waist 27 to 28.5 in, hip 36.4 to 38 in	SM	not published	waist 27 to 29 in, hip 36 to 38 in	US numeric 4-6
M	waist 28.9 to 30.5 in, hip 38.6 to 40 in	MD	not published	waist 29 to 31 in, hip 38 to 40 in	US numeric 8-10
L	waist 30.9 to 33.5 in, hip 40.6 to 42.5 in	LG	not published	waist 31 to 34 in, hip 40 to 43 in	US numeric 12-14
XL	waist 34.1 to 36.4 in, hip 42.9 to 45.5 in	XL	XL	waist 34 to 37 in, hip 43 to 46 in	US numeric 16
2XL	waist 37 to 40 in, hip 46.1 to 49 in	XXL	XXL	waist 37 to 40 in, hip 46 to 49 in	US numeric 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

Alo Yoga size guide, read on 2026-09-17. Alo Yoga on TrueToSize
Under Armour size guide, read on 2026-09-17. Under Armour on TrueToSize

Under Armour to Alo Yoga