adidas vs Under Armour: which size fits the same?
In polos, an adidas L is closest to an Under Armour L (the same around).
Polos
adidas and Under Armour polos measure about the same at the same size (within ¾″ around). An adidas L is closest to an Under Armour L (the same around).
| adidas | Chest · length | Closest Under Armour | Chest · length | Under Armour is |
|---|---|---|---|---|
| adidas XS | 37¾″ · 28″ | none close | ||
| adidas S | 40¼″ · 28¾″ | Under Armour S | 40½″ · 29″ | ½″ roomier |
| adidas M | 43½″ · 29½″ | Under Armour M | 43½″ · 29½″ | the same around |
| adidas L | 46½″ · 30½″ | Under Armour L | 46½″ · 30″ | the same around |
| adidas XL | 49¾″ · 31¼″ | Under Armour XL | 49½″ · 31″ | the same around |
| adidas XXL | 53½″ · 32″ | Under Armour XXL | 52½″ · 32″ | 1″ snugger |
| adidas 3XL | 57½″ · 33″ | Under Armour 3XL | 55½″ · 33″ | 2″ snugger |
From adidas: adidas Ultimate365 Solid Polo (A514), adidas Performance Polo (A230), adidas Performance Piqué Polo (A430). From Under Armour: Under Armour Tech Polo (1370399). Relaxed and oversized cuts are left out.
More: adidas sizing · Under Armour sizing
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Garment measurements: the shirt itself, chest all the way around and length from shoulder to hem, from each brand's own chart or wholesale spec sheet, checked November 2026. Shirts with half or more cotton are shown as they come out of a dryer (about 2% less around and 4% shorter). Brands change their cuts, so check the shop's chart before you buy.