Nike vs Sport-Tek: which size fits the same?
In tees, a Nike L is closest to a Sport-Tek M (1¼″ snugger). In polos, a Nike L is closest to a Sport-Tek L (the same around).
Tees
Sport-Tek tees measure about 1½″ more around than Nike at the same size. A Nike L is closest to a Sport-Tek M (1¼″ snugger).
| Nike | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Nike XS | 33¼″ · 26″ | none close | ||
| Nike S | 37¾″ · 27½″ | Sport-Tek XS | 37″ · 27″ | ¾″ snugger |
| Nike M | 40½″ · 27½″ | Sport-Tek S | 40″ · 28″ | ½″ snugger |
| Nike L | 44¼″ · 28¾″ | Sport-Tek M | 43″ · 29″ | 1¼″ snugger |
| Nike XL | 48¼″ · 29½″ | Sport-Tek XL | 49″ · 31″ | ¾″ roomier |
| Nike XXL | 52″ · 30¼″ | Sport-Tek XXL | 52″ · 32″ | the same around |
| Nike 3XL | 56″ · 31″ | Sport-Tek 3XL | 56″ · 32½″ | the same around |
From Nike: Nike Team rLegend Tee, Nike Legend Tee, Nike Core Cotton Tee. From Sport-Tek: Sport-Tek PosiCharge Competitor Tee (ST350). Relaxed and oversized cuts are left out.
Polos
Nike and Sport-Tek polos measure about the same at the same size (within ¾″ around). A Nike L is closest to a Sport-Tek L (the same around).
| Nike | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Nike XS | 37″ · 28¾″ | Sport-Tek XS | 37½″ · 28″ | ½″ roomier |
| Nike S | 40¼″ · 29¼″ | Sport-Tek S | 40½″ · 29″ | the same around |
| Nike M | 43¼″ · 29½″ | Sport-Tek M | 43½″ · 30″ | the same around |
| Nike L | 46½″ · 30¼″ | Sport-Tek L | 46½″ · 31″ | the same around |
| Nike XL | 50½″ · 31½″ | Sport-Tek XL | 49½″ · 32″ | 1″ snugger |
| Nike XXL | 54½″ · 32¾″ | Sport-Tek XXL | 52½″ · 33″ | 2″ snugger |
| Nike 3XL | 58¼″ · 34″ | Sport-Tek 3XL | 56½″ · 33½″ | 1¾″ snugger |
From Nike: Nike Dri-FIT Micro Pique 2.0 Polo, Nike Dri-FIT Victory Solid Polo, Nike Dri-FIT Legacy Polo, Nike Dri-FIT Vertical Mesh Polo, Nike Dry Essential Solid Polo. From Sport-Tek: Sport-Tek Micropique Sport-Wick Polo (ST650). Relaxed and oversized cuts are left out.
More: Nike 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.