Polo Ralph Lauren vs Sport-Tek: which size fits the same?
In tees, a Polo Ralph Lauren L is closest to a Sport-Tek M (1″ snugger). In polos, a Polo Ralph Lauren L is closest to a Sport-Tek M (the same around).
Tees
Sport-Tek tees measure about 1¾″ more around than Polo Ralph Lauren at the same size. A Polo Ralph Lauren L is closest to a Sport-Tek M (1″ snugger).
| Polo Ralph Lauren | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Polo Ralph Lauren XS | 34¾″ · 25½″ | none close | ||
| Polo Ralph Lauren S | 37¾″ · 26¼″ | Sport-Tek XS | 37″ · 27″ | ¾″ snugger |
| Polo Ralph Lauren M | 40¾″ · 27″ | Sport-Tek S | 40″ · 28″ | ¾″ snugger |
| Polo Ralph Lauren L | 44″ · 27¾″ | Sport-Tek M | 43″ · 29″ | 1″ snugger |
| Polo Ralph Lauren XL | 48″ · 29¼″ | Sport-Tek XL | 49″ · 31″ | 1″ roomier |
| Polo Ralph Lauren XXL | 52″ · 30¾″ | Sport-Tek XXL | 52″ · 32″ | the same around |
From Polo Ralph Lauren: Polo Ralph Lauren Classic Fit Jersey Crewneck T-Shirt, Polo Ralph Lauren Custom Slim Fit Jersey Crewneck T-Shirt. From Sport-Tek: Sport-Tek PosiCharge Competitor Tee (ST350). Relaxed and oversized cuts are left out.
Polos
Sport-Tek polos measure about 2½″ more around than Polo Ralph Lauren at the same size. A Polo Ralph Lauren L is closest to a Sport-Tek M (the same around).
| Polo Ralph Lauren | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Polo Ralph Lauren XS | 34¼″ · 24½″ | none close | ||
| Polo Ralph Lauren S | 37¼″ · 25¼″ | Sport-Tek XS | 37½″ · 28″ | the same around |
| Polo Ralph Lauren M | 40¼″ · 26″ | Sport-Tek S | 40½″ · 29″ | the same around |
| Polo Ralph Lauren L | 43½″ · 27″ | Sport-Tek M | 43½″ · 30″ | the same around |
| Polo Ralph Lauren XL | 47½″ · 28¼″ | Sport-Tek L | 46½″ · 31″ | 1″ snugger |
| Polo Ralph Lauren XXL | 51½″ · 29¾″ | Sport-Tek XXL | 52½″ · 33″ | 1″ roomier |
From Polo Ralph Lauren: Polo Ralph Lauren Custom Slim Fit Mesh Polo. From Sport-Tek: Sport-Tek Micropique Sport-Wick Polo (ST650). Relaxed and oversized cuts are left out.
More: Polo Ralph Lauren sizing · Sport-Tek 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.