adidas vs Port Authority: which size fits the same?
In polos, an adidas L is closest to a Port Authority L (1″ snugger).
Polos
adidas polos measure about 1¼″ more around than Port Authority at the same size. An adidas L is closest to a Port Authority L (1″ snugger).
| adidas | Chest · length | Closest Port Authority | Chest · length | Port Authority is |
|---|---|---|---|---|
| adidas XS | 37¾″ · 28″ | Port Authority XS | 36½″ · 27½″ | 1¼″ snugger |
| adidas S | 40¼″ · 28¾″ | Port Authority S | 39½″ · 28½″ | ¾″ snugger |
| adidas M | 43½″ · 29½″ | Port Authority M | 42½″ · 29½″ | 1″ snugger |
| adidas L | 46½″ · 30½″ | Port Authority L | 45½″ · 30½″ | 1″ snugger |
| adidas XL | 49¾″ · 31¼″ | Port Authority XL | 48½″ · 31¼″ | 1¼″ snugger |
| adidas XXL | 53½″ · 32″ | Port Authority XXL | 51½″ · 32¼″ | 2″ snugger |
| adidas 3XL | 57½″ · 33″ | Port Authority 3XL | 55½″ · 32¾″ | 2″ snugger |
From adidas: adidas Ultimate365 Solid Polo (A514), adidas Performance Polo (A230), adidas Performance Piqué Polo (A430). 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). Relaxed and oversized cuts are left out.
More: adidas sizing · Port Authority 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.