Pima cotton: the word, the mark, and the fibre underneath
Pima is a fibre, where percale is a weave. It names a type of extra-long staple cotton, meaning cotton whose individual fibres are unusually long. Longer fibres leave fewer ends sticking out of the yarn, which is why they feel smoother and resist pilling.
The catch is that the word on the label and the fibre in the sheet are two different things. Supima, the trademark holder for American-grown extra-long staple cotton, states plainly on its own site that at retail pima is a generic term for better cotton and does not necessarily mean the fibre is extra-long staple. Supima itself is a registered trademark, and a product has to be sourced through a licensed supply chain to carry it, which is what makes that version of the claim checkable. Egyptian cotton names a country rather than a grade, though there is a genuine Egyptian Cotton trademark and accreditation procedure behind it, run by the Cotton Egypt Association, which states it uses DNA testing to identify the cotton. So the practical rule is short: a mark with a programme behind it can be checked, a descriptive word cannot. We publish no sheet picks, because we have verified no sheets.
What pima cotton is
Pima is a type of cotton grown for long fibres. Cotton is sold in broad fibre-length families, and the long and extra-long staple families are the ones that end up in fabrics sold as premium. Pima belongs to that end of the range, and the reason anybody cares is mechanical rather than romantic: a longer fibre can be spun into a smoother, stronger yarn with fewer loose ends on the surface of the finished cloth.
That is the fibre. It sits underneath, and independently of, everything else printed on a sheet package. Our guide to what percale is covers the other half of the label, the weave, and it makes the same point from the opposite direction: the fibre decides absorbency and breathability, the weave decides feel and drape. A sheet can be pima cotton in a percale weave, pima cotton in a sateen weave, or something else entirely wearing a word that sounds like either.
A word, a mark, and the difference
Cotton names on bedding fall into two categories that look identical on a packet. Some are descriptions that anyone can print, and some are marks that a programme controls. The first category tells you what the seller wants you to think; only the second can be checked by someone other than the seller.
This is the same distinction we draw about organic materials elsewhere on the site, where a certification is an audited claim and a descriptive adjective is not. Our guide to organic certifications works through what each of those marks actually verifies. Cotton names on bedding behave the same way.
Staple length, the property underneath
Staple length is simply how long the individual fibres are before they are spun into yarn. Short fibres leave many ends exposed along the surface of the yarn, and those ends are what rub up into pills and what make a fabric feel slightly rough. Longer fibres mean fewer ends per length of yarn, so the same weave comes out smoother and holds up better to washing.
For a sense of scale, Supima states on its own site that the most common cotton grown around the world typically has a fibre length of about 1 inch, while its own cotton averages about 1.5 inches. That is the trademark holder describing the cotton it exists to promote, so treat it as a sourced figure rather than an independent measurement, and note that we have verified no comparable published figure for pima generally or for Egyptian cotton. Supima also states that its cotton represents less than 1 percent of the cotton grown in the world, and that it is grown only in California, Arizona, Texas and New Mexico.
Pima, Supima and Egyptian, side by side
Read this as five different kinds of claim rather than five products. What separates them is who, if anyone, can be held to the statement.
| On the label | What it is | Who stands behind it | What it guarantees | What it does not |
|---|---|---|---|---|
| Pima | A word for a type of extra-long staple cotton | Nobody. Any listing can print it | Nothing on its own | Per Supima's own FAQ, at retail pima is a generic term for better cotton and does not necessarily mean the fibre is extra-long staple |
| Supima | A registered trademark for American-grown extra-long staple cotton | The Supima Association, through a licensed supply chain | That the product was sourced through that licensed chain | It is a sourcing and origin claim, not a promise about weave, thread count or how the sheet feels |
| Egyptian cotton (the words) | A country of origin | Nobody, when it is only printed as text | Nothing you can check from the packet | Origin is not a grade. Supima's FAQ argues most Egyptian cotton is long-staple or regular rather than extra-long staple, which is a rival designation holder speaking, so weigh it accordingly |
| The Egyptian Cotton mark | A trademark applied through an accreditation procedure | The Cotton Egypt Association | That the association accredited the product, and it states it uses DNA testing to identify Egyptian cotton | The association does not publish a counterfeit rate on the page we read, so neither do we |
| Thread count | Threads per square inch | Nobody. It is self-declared | Nothing about fibre quality | A high number can mean a denser and less breathable fabric rather than a better one |
Sources, named in text rather than linked: the Supima Association's own FAQ and the Cotton Egypt Association's own site, both read 26 July 2026. Supima is the holder of one of these trademarks, so its description of Egyptian cotton is an interested party discussing a rival designation, which is why the Egyptian side above comes from the Egyptian association instead.
What we cannot tell you
Three things you will see stated confidently elsewhere are missing from this page on purpose.
- How much "Egyptian cotton" on the market is mislabelled. A percentage circulates widely. The Cotton Egypt Association's own page acknowledges that imitations exist but publishes no rate that we could verify, so we give no number.
- A staple length for pima or for Egyptian cotton. The only figures we found published by a primary source are Supima's, and they describe common cotton and Supima's own cotton. We are not going to convert a claim about one cotton into a specification for another.
- Which brand of sheets to buy. We have verified the specifications, price and stock of no bed sheets, so we name none. That is a description of our own coverage rather than a verdict on the market, and it is why our whole sheets section is guidance and no product picks.
How to read a sheet listing
- Separate the fibre from the weave. They are two independent facts and both appear on the same packet. Pima is a fibre answer; percale is a weave answer, and the weave decides more of how the sheet feels.
- Look for a mark, not an adjective. If extra-long staple fibre is what you are paying extra for, the version of that claim that somebody administers is worth more than the version anyone can type.
- Treat thread count as the least useful number on the packet. It counts threads, not quality, and pushing it up tends to make a fabric denser rather than better.
- Check the fibre content line, not the marketing line. A sheet described in the headline as pima can still be a blend further down the specification.
- Get the size right before the fibre. A beautiful sheet in the wrong pocket depth is the wrong sheet. Our guide to deep pocket sheets explains why a topper changes the number you need.
- If sleeping cool is the real goal, start with the weave. Our guide to cooling bed sheets covers what actually moves the temperature, and the fibre name is not the main lever.
Common questions
Is pima cotton the same as Supima?
Not quite, and the difference is who stands behind the word. Supima describes the distinction on its own site: at retail, pima is a generic term for better cotton that does not necessarily mean extra-long staple fibre, while Supima is a trademark for American-grown extra-long staple cotton, and a product must be sourced through a licensed supply chain to carry it. So pima is a description and Supima is a claim someone can be held to.
What is staple length and why does it matter?
Staple length is how long the individual cotton fibres are. Longer fibres mean fewer fibre ends poking out of the finished yarn, which is why long-staple fabrics feel smoother and resist pilling. Supima states that the most common cotton grown worldwide typically runs about 1 inch while its own fibre averages 1.5 inches. That figure is the trademark holder describing its own cotton, and we have verified no comparable published figure for pima or Egyptian cotton.
Is Egyptian cotton better than pima cotton?
We are not going to rank them, because the two words are not the same kind of claim. Egyptian cotton names a country of origin, and origin is not a grade. There is a genuine Egyptian Cotton trademark behind an accreditation procedure, run by the Cotton Egypt Association, which states it uses DNA testing to identify the cotton. The mark is checkable; the words on their own are not, whichever designation they belong to.
Does "100% pima cotton" mean the sheet is extra-long staple?
It means the fabric is cotton and the listing has chosen the word pima. It does not confirm the fibre length, because pima at retail is a generic descriptor rather than a verified grade. If extra-long staple is what you are paying for, look for a mark with a programme behind it, such as Supima, rather than for the descriptive word.
Do pima cotton sheets sleep cool?
The fibre is only half of it. Cotton of any staple length is absorbent and breathable, but how cool a sheet sleeps is decided mostly by the weave and the density of the fabric, not by the name of the cotton. A percale weave sleeps cooler than a sateen woven from exactly the same fibre. Read the weave and the fibre as two separate facts about the same sheet.