Does Under Armour run big or small?
Under Armour tees run big, about 1¾″ roomier around than other brands at the same size. Under Armour polos run true to size, within ¾″ of other brands at the same size.
Tees: big, about 1¾″ roomier around than other brands at the same size
| Size | Under Armour chest · length | Other brands (typical) | Under Armour is |
|---|---|---|---|
| S | 40″ · 28¾″ | 38″ · 27″ | 2¼″ roomier |
| M | 43″ · 29¼″ | 40¾″ · 27¾″ | 2¼″ roomier |
| L | 46″ · 29¾″ | 43½″ · 28½″ | 2½″ roomier |
| XL | 49″ · 30¾″ | 47″ · 29½″ | 2″ roomier |
| XXL | 52″ · 31¾″ | 50¼″ · 30″ | 1¾″ roomier |
| 3XL | 55″ · 32¾″ | 55″ · 31½″ | the same around |
Under Armour tees here: Under Armour Team Tech Tee (1376842), Under Armour Athletic 2.0 Tee (1383264). Compared with 39 tees from other brands.
Polos: true to size, within ¾″ of other brands at the same size
| Size | Under Armour chest · length | Other brands (typical) | Under Armour is |
|---|---|---|---|
| S | 40½″ · 29″ | 40″ · 28¼″ | ½″ roomier |
| M | 43½″ · 29½″ | 43″ · 29″ | ½″ roomier |
| L | 46½″ · 30″ | 45¾″ · 30″ | ¾″ roomier |
| XL | 49½″ · 31″ | 49″ · 30¾″ | ½″ roomier |
| XXL | 52½″ · 32″ | 53″ · 32″ | ½″ snugger |
| 3XL | 55½″ · 33″ | 57½″ · 33″ | 2″ snugger |
Under Armour polos here: Under Armour Tech Polo (1370399). Compared with 24 polos from other brands.
Under Armour compared with
adidas · Buck Mason · Champion · Everlane · Hanes · J.Crew · Mack Weldon · Nike · Polo Ralph Lauren · TravisMathew · Uniqlo
Get your exact size in any of these
Add three shirts you own that fit well. FitCard compares their real measurements with every shirt here and tells you the one size to buy, and why, in terms of your own shirts. Free, no tape measure.
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.