J.Crew vs Under Armour: which size fits the same?
In tees, a J.Crew L is closest to an Under Armour M (½″ snugger). In polos, a J.Crew L is closest to an Under Armour M (the same around).
Tees
Under Armour tees measure about 2½″ more around than J.Crew at the same size. A J.Crew L is closest to an Under Armour M (½″ snugger).
| J.Crew | Chest · length | Closest Under Armour | Chest · length | Under Armour is |
|---|---|---|---|---|
| J.Crew XS | 34¾″ · 26″ | none close | ||
| J.Crew S | 37¾″ · 26″ | none close | ||
| J.Crew M | 40¾″ · 26¾″ | Under Armour S | 40″ · 28¾″ | ¾″ snugger |
| J.Crew L | 43½″ · 27¾″ | Under Armour M | 43″ · 29¼″ | ½″ snugger |
| J.Crew XL | 46½″ · 28¾″ | Under Armour L | 46″ · 29¾″ | ½″ snugger |
| J.Crew XXL | 49½″ · 29¼″ | Under Armour XL | 49″ · 30¾″ | ½″ snugger |
From J.Crew: J.Crew Broken-in T-Shirt, J.Crew Broken-in Pocket T-Shirt. From Under Armour: Under Armour Team Tech Tee (1376842), Under Armour Athletic 2.0 Tee (1383264). Relaxed and oversized cuts are left out.
Polos
Under Armour polos measure about 3″ more around than J.Crew at the same size. A J.Crew L is closest to an Under Armour M (the same around).
| J.Crew | Chest · length | Closest Under Armour | Chest · length | Under Armour is |
|---|---|---|---|---|
| J.Crew XS | 34¾″ · 26″ | none close | ||
| J.Crew S | 37¾″ · 26″ | none close | ||
| J.Crew M | 40¾″ · 26¾″ | Under Armour S | 40½″ · 29″ | the same around |
| J.Crew L | 43½″ · 27¾″ | Under Armour M | 43½″ · 29½″ | the same around |
| J.Crew XL | 46½″ · 28¾″ | Under Armour L | 46½″ · 30″ | the same around |
| J.Crew XXL | 49½″ · 29¼″ | Under Armour XL | 49½″ · 31″ | the same around |
| J.Crew 3XL | 52½″ · 29¼″ | Under Armour XXL | 52½″ · 32″ | the same around |
From J.Crew: J.Crew Washed Piqué Polo Shirt. From Under Armour: Under Armour Tech Polo (1370399). Relaxed and oversized cuts are left out.
More: J.Crew sizing · Under Armour 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.