Port Authority vs Sport-Tek: which size fits the same?
In polos, a Port Authority L is closest to a Sport-Tek L (1″ roomier).
Polos
Sport-Tek polos measure about 1″ more around than Port Authority at the same size. A Port Authority L is closest to a Sport-Tek L (1″ roomier).
| Port Authority | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Port Authority XS | 36½″ · 27½″ | Sport-Tek XS | 37½″ · 28″ | 1″ roomier |
| Port Authority S | 39½″ · 28½″ | Sport-Tek S | 40½″ · 29″ | 1″ roomier |
| Port Authority M | 42½″ · 29½″ | Sport-Tek M | 43½″ · 30″ | 1″ roomier |
| Port Authority L | 45½″ · 30½″ | Sport-Tek L | 46½″ · 31″ | 1″ roomier |
| Port Authority XL | 48½″ · 31¼″ | Sport-Tek XL | 49½″ · 32″ | 1″ roomier |
| Port Authority XXL | 51½″ · 32¼″ | Sport-Tek XXL | 52½″ · 33″ | 1″ roomier |
| Port Authority 3XL | 55½″ · 32¾″ | Sport-Tek 3XL | 56½″ · 33½″ | 1″ roomier |
From Port Authority: Port Authority Silk Touch Polo (K500), Port Authority Dry Zone UV Micro-Mesh Polo (K110), Port Authority Core Classic Pique Polo (K100). From Sport-Tek: Sport-Tek Micropique Sport-Wick Polo (ST650). Relaxed and oversized cuts are left out.
More: Port Authority 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.