Under Armour vs Uniqlo: which size fits the same?
In tees, an Under Armour L is closest to an Uniqlo L (1½″ snugger). In polos, an Under Armour L is closest to an Uniqlo L (1″ snugger).
Tees
Under Armour tees measure about 1¼″ more around than Uniqlo at the same size. An Under Armour L is closest to an Uniqlo L (1½″ snugger).
| Under Armour | Chest · length | Closest Uniqlo | Chest · length | Uniqlo is |
|---|---|---|---|---|
| Under Armour S | 40″ · 28¾″ | Uniqlo S | 39¼″ · 26¼″ | ¾″ snugger |
| Under Armour M | 43″ · 29¼″ | Uniqlo M | 41¾″ · 27¼″ | 1¼″ snugger |
| Under Armour L | 46″ · 29¾″ | Uniqlo L | 44½″ · 28½″ | 1½″ snugger |
| Under Armour XL | 49″ · 30¾″ | Uniqlo XL | 48″ · 29¼″ | 1″ snugger |
| Under Armour XXL | 52″ · 31¾″ | Uniqlo XXL | 50¾″ · 29½″ | 1¼″ snugger |
| Under Armour 3XL | 55″ · 32¾″ | Uniqlo 3XL | 53¾″ · 30¼″ | 1¼″ snugger |
From Under Armour: Under Armour Team Tech Tee (1376842), Under Armour Athletic 2.0 Tee (1383264). From Uniqlo: Uniqlo AIRism Cotton Crew Neck T-Shirt, Uniqlo AIRism T-Shirt, Uniqlo SUPIMA Cotton T-Shirt, Uniqlo DRY-EX T-Shirt, Uniqlo DRY Color T-Shirt, Uniqlo DRY Waffle Henley T-Shirt. Relaxed and oversized cuts are left out.
Polos
Under Armour polos measure about 1″ more around than Uniqlo at the same size. An Under Armour L is closest to an Uniqlo L (1″ snugger).
| Under Armour | Chest · length | Closest Uniqlo | Chest · length | Uniqlo is |
|---|---|---|---|---|
| Under Armour S | 40½″ · 29″ | Uniqlo S | 40¼″ · 26¼″ | the same around |
| Under Armour M | 43½″ · 29½″ | Uniqlo M | 42¾″ · 27″ | ¾″ snugger |
| Under Armour L | 46½″ · 30″ | Uniqlo L | 45½″ · 28¼″ | 1″ snugger |
| Under Armour XL | 49½″ · 31″ | Uniqlo XL | 48½″ · 29″ | 1″ snugger |
| Under Armour XXL | 52½″ · 32″ | Uniqlo 3XL | 54″ · 30″ | 1½″ roomier |
| Under Armour 3XL | 55½″ · 33″ | Uniqlo 3XL | 54″ · 30″ | 1½″ snugger |
From Under Armour: Under Armour Tech Polo (1370399). From Uniqlo: Uniqlo DRY-EX Polo Shirt, Uniqlo AIRism Cotton Pique Polo Shirt, Uniqlo DRY Pique Polo Shirt. Relaxed and oversized cuts are left out.
More: Under Armour sizing · Uniqlo sizing
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.