Supima makes up less than 1% of the cotton grown in the world, according to the Supima FAQ.
Buck Mason calls Pima and Slub its two flagship tee fabrics. The Pima Classic’s product page says it is 100% USA-grown Supima cotton. The product name and the fiber inside make different claims. I’ll explain the difference below.
I own four Buck Mason tees: the Pima Classic, the Slub Classic, a Field-Spec and a Hemp Yuma. I bought all four at full price. I’ve worn them for six months to a year.
They aren’t my everyday tee. That’s Faherty’s regenerative cotton tee. I wear a Buck Mason two or three times a month. All four have held up phenomenally well.
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The verdict
I give Buck Mason’s tees 4.5 out of 5, and I’d buy them again at full price. None has shrunk. None has a wear problem yet.
The one catch is length. They’re hemmed a bit short, so long torsos should check the size chart. The Pima Classic is the one I grab most.
The four tees at a glance
Fabric, weight and price come from Buck Mason’s product pages on November 12, 2026. GSM means grams per square meter, so a higher number is a heavier fabric. Our natural fiber guide explains fabric weights in more detail.
| Tee | Fabric | Weight | Made in | Price |
|---|---|---|---|---|
| Pima Classic Tee | 100% USA-grown Supima cotton | 140 GSM | Mohnton, PA | $48 |
| Slub Classic Tee | USA-grown cotton with a slub texture | 145 GSM | Mohnton, PA | $48 |
| Field-Spec Cotton Heavy Tee | 100% cotton | 310 GSM | Imported | $62 |
| Yuma Hemp Cotton Classic Tee | 55% hemp, 45% cotton | 190 GSM | Imported | $68 |
Pima Classic Tee: the one I grab most
Most of the time I wear the Pima under an overshirt or a jacket. In Florida summers I wear it on its own.
Buck Mason makes it at its own mill, Buck Mason Knitting Mills in Mohnton, Pennsylvania. The jersey is 140 GSM Supima with a straight hem. It is garment washed with enzymes and softener for a lived-in feel, per the product page.
Buck Mason says long-staple fibers give the Pima a smooth hand and more structure than its Slub. The result, per its FAQ, is a tee that hangs more evenly off the body.
It costs $48. Buck Mason listed nine colors in stock on November 12. White came in every size from XS to XXL. Shop the Pima Classic Tee
Slub Classic Tee
The Slub is the textured one. It shares the Pima’s $48 price, classic fit and straight hem.
A slub is a thicker spot in the yarn. Buck Mason says that gives its Slub tees faint horizontal streaks and a light, vintage feel. Because the thickness varies, the fabric drapes lightly on the body, per its FAQ.
It is 145 GSM USA-grown cotton, sewn at the same Pennsylvania mill. Buck Mason lists it as pre-shrunk on the product page. All six colors were in stock on November 12.
Like the others, mine still feels great and has held up well. Shop the Slub Classic Tee
Field-Spec Heavy Tee
Field-Spec is Buck Mason’s heavy cotton line. The jersey is 310 GSM, which Buck Mason says is double the density and weight of its core tees.
The brand compares its weight and hand to rugby shirts and vintage athletic wear. It is washed so it feels broken in from the first wear, per the product page.
The line comes in several cuts. The classic-fit version is the Field-Spec Cotton Heavy Tee at $62, and there is a boxier 90s cut. Unlike the Pima and Slub, it is imported.
Mine has had no wear issues. See the Field-Spec Cotton Heavy Tee
Yuma Hemp Cotton Tee
The Yuma blends 55% hemp with 45% cotton at 190 GSM. Buck Mason says the yarn-dyed blend wicks moisture and breathes easily, per the product page.
It is also the only one of the four that Buck Mason says to lay flat to dry.
Stock was thin on November 12. Buck Mason listed one color, Faded Black, in small, XL and XXL only. It costs $68.
For more on the fiber, see our hemp shirts guide. See the Yuma Hemp Cotton Classic Tee
Pima vs Supima cotton: what the tag means
Supima says that at retail, pima is a generic term for better cotton. It does not always mean extra-long staple cotton, per the Supima FAQ.
Supima is a trademark for American-grown, extra-long staple cotton. A product can only carry it through a licensed supply chain. It is grown only in California, Arizona, Texas and New Mexico.
Supima credits the long fiber with strength, softness and color retention. Keep in mind that its site speaks for its own trademark.
So read past the product name. Buck Mason calls its tee the Pima Classic, but the product page promises Supima, the narrower claim.
Buck Mason sizing: check the length
Mine fit true to size. The catch is length. The hem sits a bit short, so if you have a long torso, check the chart first.
These are Buck Mason’s garment measurements for the Pima Classic, in inches. Its FAQ says sizing varies between styles, so check each tee’s own chart.
| Size | Chest | Length |
|---|---|---|
| XS | 18 3/4 | 26 1/2 |
| S | 19 3/4 | 27 |
| M | 20 3/4 | 27 1/2 |
| L | 21 3/4 | 28 |
| XL | 23 1/4 | 28 3/4 |
| XXL | 24 3/4 | 29 1/2 |
Lay a tee you like flat and measure its length from shoulder to hem. Compare that number with the chart before you order.
How I wash them
I wash them cold. Then I air dry them or use the lowest dryer setting, never heat. After six months to a year, none has shrunk.
Buck Mason’s care labels are close to that. The Pima says machine wash cold and tumble dry low. The Yuma is the exception: lay it flat to dry.
Which one to buy
- Under an overshirt or jacket: the Pima Classic. It is the one I reach for.
- For texture on its own: the Slub, which Buck Mason says drapes lightly.
- For a heavier tee with more structure: the Field-Spec, at more than twice the Pima’s weight.
- For a hemp blend: the Yuma, if your size is in stock.
Choosing between brands? Our Buck Mason vs Taylor Stitch guide gives Buck Mason the win on tees. For outfit ideas, see how to style a white T-shirt.
Returns, shipping and sales
Buck Mason gives you 365 days to return unworn, unwashed items for a full refund. Store returns are free, and mail returns cost $8, per its FAQ.
Shipping is free on orders over $150.
Don’t wait for a code. Buck Mason’s FAQ says it does not offer discounts or promotions. Our guide to whether Buck Mason ever goes on sale has the details.
Frequently asked questions
Do Buck Mason shirts shrink?
Mine haven’t. I wash my four tees cold and air dry them or use the lowest dryer setting. Buck Mason lists the Slub as pre-shrunk and garment washes the Pima. Its care labels say to wash cold and tumble dry low. The Yuma should dry flat.
Is Supima better than pima cotton?
Supima is the narrower claim. It is a trademark for American-grown, extra-long staple cotton, sold through a licensed supply chain. Supima says pima at retail is a generic term that does not always mean extra-long staple. A Supima tag tells you more about the fiber. It says nothing about fit or construction.
What size Buck Mason tee should I get?
Your usual size. Mine fit true to size. The catch is length, since the hem runs a bit short. A Large Pima Classic measures 28 inches long on Buck Mason’s chart. If you have a long torso, compare that with a tee you already like.
Where are Buck Mason tees made?
The Pima and Slub are made at Buck Mason Knitting Mills in Mohnton, Pennsylvania, per their product pages. The Field-Spec and the Yuma are listed as imported.
Keep reading
- Buck Mason review
- Buck Mason vs Taylor Stitch
- Brands like Buck Mason
- How to style a white T-shirt
- ADSUM Core Crewneck review
Prices, specs and stock as shown on Buck Mason’s site on November 12, 2026.
