DESCENTE to Under Armour size

The short answer

DESCENTE S is Under Armour SM by the two brands' own charts. 6 of 6 DESCENTE sizes land on a different label at Under Armour.

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

Every DESCENTE Japan sizing size read across to Under Armour. Letter sizes on the left, Letter on the right.
DESCENTE Japan sizing	DESCENTE builds it for	Under Armour, by chart	Same label	Under Armour builds it for	Under Armour also prints
S	chest 33.5 to 35.8 in, waist 28 to 30.3 in	SM	not published	chest 34 to 37 in, waist 29 to 31 in	not published
M	chest 35 to 37.4 in, waist 29.5 to 31.9 in	SM	not published	chest 34 to 37 in, waist 29 to 31 in	not published
L	chest 36.6 to 39 in, waist 31.1 to 33.5 in	MD	not published	chest 37 to 41 in, waist 31 to 34 in	not published
O	chest 38.2 to 40.6 in, waist 32.7 to 35 in	MD	not published	chest 37 to 41 in, waist 31 to 34 in	not published
XO	chest 39.8 to 42.1 in, waist 34.3 to 36.6 in	MD	not published	chest 37 to 41 in, waist 31 to 34 in	not published
2XO(XA)	chest 41.3 to 43.7 in, waist 35.8 to 38.2 in	LG	not published	chest 41 to 44 in, waist 34 to 37 in	not published

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.

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Sources

DESCENTE Japan sizing size guide, read on 2026-09-25.
Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize

Under Armour to DESCENTE