A Fabric Procurement Checklist: How to Evaluate Supima Cotton, Rayon, and Polyester

Who This Is For

If you sign the purchase order for company T-shirts, breakroom towels, or client-facing uniforms, this checklist is for you. I'm an office administrator for a 300-person company with three locations. I manage roughly $70,000 in purchasing per year across eight vendors, and I report to both operations and finance. I don't have a textile lab. I have a binder of past mistakes.

This is a six-step checklist. It doesn't tell you to buy the most expensive option. It tells you how to specify the right fabric so you don't have to hear about the wrong one from your manager later.

Step 1: Name the Fiber, Not the Feeling

Before you compare “premium” versus “budget,” write down the fiber. Words like “soft,” “natural,” “breathable,” and “sustainable” do not tell you what the product is made of. The fiber is the starting point.

• Cotton is a natural cellulose fiber. It's absorbent, breathable, and comfortable next to the skin. But “cotton” alone doesn't tell you whether the fabric will last.
• Rayon is a regenerated cellulose fiber made from wood pulp. It's soft, drapes well, and absorbs moisture. It's also not cotton, and it can weaken when wet.
• Polyester is a petroleum-based synthetic. It's durable, quick-drying, and wrinkle-resistant, but less breathable than cotton.
• Supima is a licensed brand of American-grown extra-long staple cotton. The name does not mean “any soft cotton.” It means the cotton fiber itself is a specific pima variety, grown in the U.S., and subject to a licensing program.

For a company T-shirt, a Supima cotton jersey is usually my first choice. The longer fiber means the yarn is smoother and the fabric is less likely to pill after repeated washings. That matters when your logo is on the chest and your employee is wearing it to a client site.

Step 2: Answer “Is Supima Cotton Breathable?” by Looking at the Knit

People search “is supima cotton breathable” because they want to know if a shirt will feel hot. The short answer: usually yes, when it's made as a typical jersey T-shirt. But breathability is a fabric property, not a fiber certificate. A tightly woven, heavyweight Supima cotton poplin won't breathe the same way as a loose Supima cotton jersey.

When you're reviewing a Supima cotton T-shirt or towel, ask for the weight and construction. For an all-day office shirt, a jersey knit around 150-180 GSM is often comfortable. For a more structured customer-facing shirt, a heavier pique can work, but it won't be as airy.

Step 3: Evaluate Cotton Towels by Fiber, Loop, and Weight

Cotton towels are one of the easiest things to get wrong. A label that says “100% cotton towel” can still be scratchy, linty, and absorbent only after ten washes. Here's what I check:

• Fiber length. Longer fibers mean fewer loose ends, less lint, and a smoother hand feel. This is where extra-long staple Supima cotton has an advantage.
• Loop construction. Terry loops create the surface area that absorbs water. More loops at a dense pile usually means more absorbent.
• GSM (grams per square meter). A 400 GSM towel is lighter and dries faster. A 600 GSM towel feels heavier, softer, and more plush but needs more time in the dryer.

In May 2023, I ordered “good quality cotton towels” for our locker rooms from a new vendor. The invoice said cotton, but there was no weight or fiber specification. They shed so much lint on the first wash that the maintenance team thought the dryer was broken. Now I put the exact GSM and fiber length requirement in every quote request.

Step 4: Put “Is Rayon Toxic?” in Perspective

If you search “rayon is it toxic,” you will find headlines about carbon disulfide, caustic soda, and heavy pollution. Some of that is true: rayon production uses hazardous chemicals, and poorly managed factories can harm workers and the environment. But the finished fabric is not automatically toxic to the wearer. That depends on how the material was processed, what finishes were applied, and what testing was done.

When someone tells you a rayon fabric is “nontoxic” or “eco-friendly,” ask for the testing certificate. Per FTC guidelines on advertising and marketing (ftc.gov, accessed January 2025), environmental and safety claims need substantiation. I do not approve a rayon shirt for employee use without an OEKO-TEX Standard 100 certificate or an equivalent document from the mill. That's not paranoia; it's paperwork.

Step 5: Compare Rayon vs Polyester by Use, Not by Hype

Rayon vs polyester which is better? There's no honest single answer. You have to ask: what is this garment doing?

• For airy office shirts or blouses, rayon is often more comfortable because it has absorbency and a soft drape. But it wrinkles and can weaken when wet.
• For aprons, industrial uniforms, or items that are washed constantly, polyester or a polyester-cotton blend is usually stronger, dries faster, and holds its shape. The downside is breathability and odor retention in some blends.
• For towels, cotton beats both. Polyester towels are not absorbent enough, and rayon towels won't survive heavy-duty use. A 100% cotton or Supima cotton terry towel is the more defensible choice.

I do not mean that budget buyers should feel bad. I mean that you should pick the material that matches the workload.

Step 6: Verify the Label Before You Approve

The step most people leave out is verification. Before you place the production order, get three things:

1. Fiber content label. In the U.S., the FTC requires most textile products to carry the generic fiber names and percentages (ftc.gov, accessed January 2025). If your supplier can't show you a label, that's a red flag.
2. A Supima license declaration if the product says Supima. The Supima name is licensed, not a generic description. If the label says “Supima style” or “like Supima cotton,” it isn't Supima. Ask for the supplier's license or fiber declaration.
3. Washing and shrinking data. Ask about shrinkage and colorfastness. In 2022 I approved “preshrunk” cotton shirts; after the first wash, the collars didn't fit right. “Preshrunk” is a process, not a promise.

Three Mistakes to Avoid

The first mistake is choosing fabric from a photo. A photo won't tell you if a T-shirt is see-through, if a towel feels rough, or if a rayon shirt will shrink. Order physical swatches.

The second mistake is treating “breathable” as a marketing word. If you need breathability, define it: air permeability, moisture vapor transmission, or weight. Ask for a number.

The third mistake is equating price with quality. A high price can come from branding, minimum order quantities, or shipping. Check the fiber, weight, construction, and label—not just the tag price.

Fabric quality directly affects how people perceive your organization. An employee who hates their uniform will not hide it. A guest who wipes their hands on a rough towel will remember it. In an office, these are the details that communicate whether you pay attention. You don't need the most expensive fabric; you need the right one, with the right label, for the job.