Sweaty Betty to Aerie (OFFLINE) leggings size

The short answer

Sweaty Betty XL is Aerie (OFFLINE) L or XL by the two brands' own charts. 2 of 7 Sweaty Betty sizes land on a different label at Aerie (OFFLINE).

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 Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
Sweaty Betty	Sweaty Betty builds it for	Aerie (OFFLINE), by chart	Same label	Aerie (OFFLINE) builds it for	Aerie (OFFLINE) also prints
XXS	waist 23 in, hip 34 in	XXS	XXS	waist 22.5 to 23.5 in, hip 32 to 33 in	US numeric 000-00
XS	waist 25 in, hip 36 in	XS	XS	waist 24.5 to 25.5 in, hip 34 to 35 in	US numeric 0-2
S	waist 27 in, hip 38 in	S	S	waist 26.5 to 27.5 in, hip 36 to 37 in	US numeric 4-6
M	waist 29 in, hip 40 in	M	M	waist 28.5 to 29.5 in, hip 38 to 39 in	US numeric 8-10
L	waist 31 in, hip 42 in	L	L	waist 31 to 32.5 in, hip 40.5 to 42 in	US numeric 12-14
XL	waist 33 in, hip 44 in	L or XL	XL	waist 31 to 32.5 in, hip 40.5 to 42 in	US numeric 12-14
XXL	waist 36 in, hip 46.5 in	XL	XXL	waist 34 to 36 in, hip 43.5 to 45.5 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
Aerie (OFFLINE) size guide, read on 2026-09-18. Aerie (OFFLINE) on TrueToSize

Aerie (OFFLINE) to Sweaty Betty