Arc'teryx to Athleta clothing size

The short answer

Arc'teryx XL is Athleta 1X by the two brands' own charts. 2 of 6 Arc'teryx sizes land on a different label at Athleta.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every Arc'teryx size read across to Athleta. Letter sizes on the left, Letter on the right.
Arc'teryx	Arc'teryx builds it for	Athleta, by chart	Same label	Athleta builds it for	Athleta also prints
XS	bust 33.1 in, waist 26.8 in, hip 36.2 in	XS	XS	bust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 in	US 0-2
S	bust 35 in, waist 28.7 in, hip 38.2 in	S	S	bust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 in	US 4-6
M	bust 37 in, waist 30.7 in, hip 40.2 in	M	M	bust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 in	US 8-10
L	bust 40.2 in, waist 33.9 in, hip 43.3 in	L	L	bust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 in	US 12-14
XL	bust 44.1 in, waist 37.8 in, hip 47.2 in	1X	XL	bust 44.3 to 46.3 in, waist 38 to 40 in, hip 47.3 to 49.3 in	US 16W-18W
XXL	bust 48 in, waist 41.7 in, hip 51.2 in	2X	not published	bust 48.3 to 50.8 in, waist 42 to 44.5 in, hip 51.3 to 53.8 in	US 20W-22W

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, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

Open in the converter Add an item you own

Sources

Arc'teryx size guide, read on 2026-09-18.
Athleta size guide, read on 2026-09-18. Athleta on TrueToSize

Athleta to Arc'teryx