What is bamboo fabric? Mostly rayon, and the FTC says the label must say so

Most bamboo fabric is rayon. Under the Federal Trade Commission's rules, a garment can carry the word bamboo as its fiber name only if it is made directly from bamboo fiber, and the FTC has said that almost none is. If the bamboo was dissolved and spun back into thread, the label must say rayon, for example "rayon made from bamboo." That is the whole rule, and the rest of this piece shows where it comes from and what it means when you read a tag.

What federal law says rayon is

The Textile Fiber Products Identification Act rules at 16 CFR 303.7, which we read on the Electronic Code of Federal Regulations as it stood on October 20, 2026, set the generic names for manufactured fibers. Paragraph (d) defines rayon as "a manufactured fiber composed of regenerated cellulose," along with fibers of regenerated cellulose in which substituents have replaced not more than 15 percent of the hydrogens of the hydroxyl groups. It adds that where the fiber is made from cellulose precipitated from an organic solution with no chemical intermediates, the term lyocell may be used.

Read that as chemistry in plain English. Wood, bamboo, cotton linters or other plant material goes in. It is dissolved, the cellulose is regenerated into a new fiber, and what comes out is a manufactured fiber. The rule names the fiber by what it is now, not by where the pulp began. Viscose, the common process, makes rayon; see our guide to viscose fabric for how that works.

Where "bamboo" is allowed

The FTC's business guidance, published in August 2009 under the title "How to Avoid Bamboozling Your Customers," draws the line. It says most "bamboo" textile products, if not all, really are rayon. Only fabric made directly from bamboo fiber, which the FTC calls "mechanically processed bamboo," can be labeled bamboo. Otherwise, the guidance says, the product "can't be called bamboo," and rayon made from bamboo should carry its generic name, such as "rayon made from bamboo."

A second FTC post, by Lesley Fair on December 9, 2015, puts it more bluntly: "If a textile isn't made directly of bamboo fiber, don't call it bamboo." It adds that "there is virtually no actual bamboo fiber out there."

The penalties that followed

The 2015 post announced settlements with four retailers that had labeled rayon as bamboo. According to the FTC, they agreed to civil penalties totaling $1.3 million, set "based on product sales and how long the violations went on."

• Bed Bath & Beyond: $500,000, including items such as "Bamboo Blend Napkins."
• Nordstrom: $360,000, including a "Gypsy 05 Bamboo Racerback Hi-Lo Dress."
• J.C. Penney: $290,000.
• Backcountry.com: $150,000.

These are the amounts the FTC stated in its post. We did not find an update to them in the sources we opened.

What the claims around bamboo get wrong

The label problem is one half. The other is what sellers say about bamboo in the ad copy. The 2009 guidance says claims that rayon fibers retain natural antimicrobial properties from the bamboo plant need the same proof as any other claim, in the form of "competent and reliable evidence, such as scientific tests and analyses." Relying on someone else's claims does not count. The guidance also says rayon "typically is made using environmentally toxic chemicals" and that no trace of the original plant remains in the finished product.

The 2015 post makes the same point about manufacturing: the process for making rayon, even from bamboo, "can involve the use of harsh chemicals." None of that makes rayon a bad fabric. It is soft, drapes well and has been sold for a century. It makes the word bamboo a marketing claim that the federal rule treats as a possible deception.

How to read a tag

Look at the fiber content line, the part the law requires. If it says rayon or "rayon made from bamboo," the label follows the rule. If it says 100 percent bamboo and the shirt feels like soft jersey, ask which kind. The FTC's own view is that true mechanically processed bamboo fiber is rare. A product page that says bamboo while the tag says rayon is the mismatch to notice, because the tag is the legal statement and the page is advertising.

The same logic applies to other fiber words. Under 16 CFR 303.18, words that imply a fiber that is not present may not be used to suggest it is there. Our explainer on fiber content label rules covers the 5 percent threshold and the general structure.

What it means for sustainability claims

Bamboo grows fast, and sellers lean on that. The FTC sources we opened do not rule on how fast bamboo grows. They address the finished fiber: the 2009 guidance says no trace of the plant remains and warns sellers against environmental claims without proof. An "eco-friendly" line on a bamboo rayon tee needs its own evidence, such as a certification or a measured comparison, not the plant's reputation.

Our take

Buy bamboo rayon if you like how it feels, and read it as rayon. Skip any page that sells "bamboo" as an antimicrobial or biodegradable fabric without showing the test. The rule has been in place and enforced for years, and the penalties in 2015 were real. What you are paying for is a soft manufactured fiber. If the label says so, the seller is following the law.