What is in dryer sheets?

The short version

We work from documents and have not tested any products. This page reads the ingredient lists that two makers publish for fragrance-free dryer sheets, and says what that does and does not show about dryer sheets in general. For which products pass a fragrance-free check, see our fragrance-free dryer sheets roundup; we do not repeat it here.

Two parts: a sheet and a coating

Both lists we read have two kinds of entry: what the sheet is made of, and the softening agents that sit on it.

Bounce Free & Gentle, 160 count. The list on the maker’s P&G SmartLabel page, captured in a browser on 2026-11-13 (our automated fetch was blocked, so this is one capture), reads: polyester sheet; dialkylester dimethyl ammonium methosulfate; fatty acids; C16-18 and C18-unsatd.; bentonite. The “C16-18 and C18-unsatd.” entry qualifies the fatty acids entry before it, as the page splits it.

Seventh Generation Free & Clear, 80 count. The maker’s page, read by our fetch on 2026-11-13, lists three softener entries: C16-18 glycerides, di-(palm carboxyethyl) hydroxyethyl methylammonium methyl sulfates, and C16-18 fatty acids, each described by the maker as plant-derived or plant-based. The sheet is listed as rayon, described as plant-based.

So the shared pattern is a fabric sheet, a quaternary-ammonium-type softener (the names ending in “methosulfate” or “methyl sulfates”), and fatty-acid entries. Bounce adds bentonite. We found no source that explains what each entry does or how much is present; lists give names, not amounts. The descriptions in brackets are the maker’s wording and we have not assessed them.

The “Fragrance Ingredient” heading

The Bounce SmartLabel page shows a heading “Fragrance Ingredient” with no entries under it, and the value reads “undefined”. That is an empty heading, not a listed ingredient. It would be a mistake to read the Bounce list as containing, or ending in, a fragrance entry. The five entries above are the whole list we captured. The same page’s title says “Unscented” and “Hypoallergenic”; those are the maker’s words, and we use them only as quotes.

What the EU glossary says about the names

The EU’s glossary of common ingredient names, Decision (EU) 2019/701, exists for cosmetics labelling. Dryer sheets are not cosmetics, so a laundry maker need not follow it, and we found no source stating how laundry labels must be worded. We ran the names through the glossary text (retrieved 2026-11-14) only to see which ones it carries:

• BENTONITE is entry 2888.
• POLYETHYLENE TEREPHTHALATE is entry 19058. The Bounce list says “polyester”, which we did not find as an exact entry, and we do not assume the two are the same.
• RAYON is entry 21144.
• STEARIC ACID is entry 24030 and PALMITIC ACID is entry 16407, both fatty acids. The label wording “fatty acids, C16-18” was not found as an exact entry.
• DIHYDROGENATED PALMOYLETHYL HYDROXYETHYLMONIUM METHOSULFATE is entry 7431. It is the name on Seventh Generation’s liquid softener list, not the sheet list.
• PARFUM is entry 16644, the glossary’s name for fragrance. Our guide to what parfum means covers it.
• No exact entry was found for “dialkylester dimethyl ammonium methosulfate” or “diethylester dimethyl ammonium chloride” (the latter is on a Downy liquid list, not a sheet list).

A name not being found does not tell you anything about the substance. It tells you that wording is not an entry in that cosmetics glossary. Our guide to fragrance allergen names on ingredient labels covers label wording for fragrance itself.

Where fragrance would show up

On these two lists, nowhere. We did not read a list for a scented sheet, so we cannot describe from a source how fragrance appears on one. What we can cite is general. The FDA’s Fragrances in Cosmetics page (retrieved 2026-11-11) says that under US regulations for cosmetics, fragrance ingredients can be listed simply as “Fragrance”, and that even some products labelled “unscented” may contain fragrance ingredients. That page is about cosmetics, and we found no equivalent source for laundry products. It is a reason to read the list and not the front of the pack; see fragrance-free versus unscented, unscented and sensitive labels, how to read an ingredient list and why “fragrance” can hide ingredients.

What the literature says about laundry products and skin

PubMed abstracts here are about laundry products generally, not dryer sheet coatings. A 2025 article (PMID 41178659) says laundry products contain substances that can potentially cause skin reactions, including surfactants, bleaches, and additives such as fragrances, enzymes and dyes, but that presence alone is in most cases not sufficient to identify them as the cause. It says concentration, method of application and the residue left on clothes after washing must also be considered, and that studies have linked only a very small percentage of cases to laundry detergents. A 2024 review (PMID 38826956) says pediatricians in the US name metals, perfumes, topical antimicrobials, excessive chemicals and fabric softeners among the most typical allergens in children. These abstracts do not say which sheet ingredient, if any, is involved. For questions about your own skin, ask a clinician or an allergy or dermatology society.

Applying this

Read the maker’s list for the exact product, scent and size, not the front claim. Look for fragrance, parfum or aroma, and check whether a “Fragrance Ingredient” heading has entries under it. Compare lists, since softener coatings look alike across the two we read. Scent in a load can also come from other places; see fragrance-free laundry detergent, laundry boosters, encapsulated laundry fragrance and how to switch to fragrance-free laundry. The category sits on our laundry hub.

What we don’t fully know

We read two fragrance-free lists, not a market sample, and no scented list. We found no source on what each softener entry does, how much of it a sheet carries, or whether it matters for a person who reacts to fragrance. The rest is under “unknowns” on this page.