Mack Weldon vs Sport-Tek: which size fits the same?
In tees, a Mack Weldon L is closest to a Sport-Tek M (1″ roomier). In polos, a Mack Weldon L is closest to a Sport-Tek L (1″ roomier).
Tees
Sport-Tek tees measure about 4″ more around than Mack Weldon at the same size. A Mack Weldon L is closest to a Sport-Tek M (1″ roomier).
| Mack Weldon | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Mack Weldon S | 38″ · 28″ | Sport-Tek XS | 37″ · 27″ | 1″ snugger |
| Mack Weldon M | 40″ · 29″ | Sport-Tek S | 40″ · 28″ | the same around |
| Mack Weldon L | 42″ · 29¾″ | Sport-Tek M | 43″ · 29″ | 1″ roomier |
| Mack Weldon XL | 44″ · 30½″ | Sport-Tek M | 43″ · 29″ | 1″ snugger |
| Mack Weldon XXL | 46″ · 31″ | Sport-Tek L | 46″ · 30″ | the same around |
From Mack Weldon: Mack Weldon SILVER Crew Neck T-Shirt, Mack Weldon Pima Crew Neck T-Shirt, Mack Weldon Pima Short Sleeve Henley. From Sport-Tek: Sport-Tek PosiCharge Competitor Tee (ST350). Relaxed and oversized cuts are left out.
Polos
Sport-Tek polos measure about 1″ more around than Mack Weldon at the same size. A Mack Weldon L is closest to a Sport-Tek L (1″ roomier).
| Mack Weldon | Chest · length | Closest Sport-Tek | Chest · length | Sport-Tek is |
|---|---|---|---|---|
| Mack Weldon S | 41″ · 27½″ | Sport-Tek S | 40½″ · 29″ | ½″ snugger |
| Mack Weldon M | 43″ · 28½″ | Sport-Tek M | 43½″ · 30″ | ½″ roomier |
| Mack Weldon L | 45½″ · 29¾″ | Sport-Tek L | 46½″ · 31″ | 1″ roomier |
| Mack Weldon XL | 48″ · 30½″ | Sport-Tek L | 46½″ · 31″ | 1½″ snugger |
| Mack Weldon XXL | 50″ · 31″ | Sport-Tek XL | 49½″ · 32″ | ½″ snugger |
From Mack Weldon: Mack Weldon Heavyweight Slub Polo, Mack Weldon SILVER Pique Polo. From Sport-Tek: Sport-Tek Micropique Sport-Wick Polo (ST650). Relaxed and oversized cuts are left out.
More: Mack Weldon 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.