What does a crossed-out symbol mean?

Do not do the thing the symbol represents — a crossed-out washtub means don't wash it, a crossed-out circle inside a square means don't tumble dry. It's the one symbol never to argue with; the manufacturer is telling you the treatment will damage the piece.

Is 'dry clean only' really only?

Mostly, yes. Under the FTC's Care Labeling Rule the manufacturer must have a reasonable basis — testing or documented evidence — for every instruction, so a dry-clean-only label is a claim that washing would damage the garment. If you ignore it and something goes wrong, that's on the wash.

Can I wash everything in cold water?

Cold is the safe default and most labels permit it, but check the tub symbol first — some instructions call for a specific temperature because the fiber or the dye needs it. And 'machine washable' on a fine knit still means the gentle cycle, not the standard one.

Garment care basics: reading the label before you wash

Most ruined garments weren’t washed too often — they were washed wrong once. The care label tells you the maximum treatment the piece can take, and every symbol on it is a ceiling, not a suggestion.

The five symbol groups

Care symbols come from the European GINETEX system, standardized as ISO 3758; US labels may carry the ASTM D5489 set alongside or instead of words — the FTC’s Care Labeling Rule requires at least one safe cleaning method and has allowed symbols since 1997. Either way, five groups appear in the same order:

Washtub — washing. The number inside is the maximum temperature in Celsius; a hand means hand wash only; a bar means a gentler cycle, two bars the wool program.
Triangle — bleach. Empty means any bleach, two diagonal lines mean oxygen (non-chlorine) only, crossed out means none.
Square — drying. A circle inside means tumble drying, with dots for heat; a horizontal line means dry flat, vertical lines mean line dry.
Iron — pressing. Dots give the maximum sole-plate temperature: one dot 110°C (230°F), two 150°C (300°F), three 200°C (392°F).
Circle — professional cleaning. The letter names the solvent: P, F, or W for professional wet cleaning.

A cross over any symbol means “do not” — and a crossed-out washtub usually means the piece wants the circle instead.

What the water temperature really means

The number in the tub is a maximum, and it is in Celsius even on an American label. Thirty means 30°C, about 86°F, and it is a ceiling: colder is safe, hotter is not. “Cold” on a US label isn’t a number — it means your cold tap, which swings with the season.

Hotter water is not cleaner water in the way people assume. Heat helps with grease and germs, but it drives shrinkage and dye loss, and most modern detergents are built for cool washes. The temperature exists for the fabric’s sake, not the soil’s.

Wool and synthetic behave differently

Wool’s enemy is agitation, not water. Each wool fiber is covered in scales, and heat, moisture, and movement make the scales interlock — that interlocking is felting, and felting is what people call shrinkage. Hence the two bars, the low temperature, and dry-flat: a wet knit hanging under its own weight stretches before it dries.

Synthetics have the opposite profile. Polyester and nylon are thermoplastics — heat is what damages them, so they want cool water and low tumble heat. Their weakness is oil: synthetics hold body odor more stubbornly than natural fibers, so a synthetic tee often needs warmer water than cotton to smell clean.

Air dry or tumble dry

The square decides this. One dot means low heat, about 60°C (140°F); two dots means normal, about 80°C (176°F); a crossed-out circle means the garment should never see a dryer.

When the label leaves the choice to you, decide by what heat does to the piece. Knits dry flat — gravity plus heat is what turns a crewneck into a tunic. Anything with an elastic waistband dries flat or on low, because heat permanently relaxes elastic. Cotton and linen benefit from the tumble, which fluffs the surface — why towels come out of a dryer softer than off a line.

The thirty-second routine

Read the label once before anything goes into the machine: find the washtub and its number, find the square, and check for crosses. Two symbols decide most care outcomes.

Frequently asked questions

What does a crossed-out symbol mean?: Do not do the thing the symbol represents — a crossed-out washtub means don't wash it, a crossed-out circle inside a square means don't tumble dry. It's the one symbol never to argue with; the manufacturer is telling you the treatment will damage the piece.
Is 'dry clean only' really only?: Mostly, yes. Under the FTC's Care Labeling Rule the manufacturer must have a reasonable basis — testing or documented evidence — for every instruction, so a dry-clean-only label is a claim that washing would damage the garment. If you ignore it and something goes wrong, that's on the wash.
Can I wash everything in cold water?: Cold is the safe default and most labels permit it, but check the tub symbol first — some instructions call for a specific temperature because the fiber or the dye needs it. And 'machine washable' on a fine knit still means the gentle cycle, not the standard one.