The sweater came back from the wash sized for a child. You checked the tag afterward, the way everyone does, and found a row of small shapes that mean nothing: a bucket with a number, a square with a circle inside, a triangle crossed out. It was all there in advance. It was simply written in a language nobody teaches, in symbols small enough to need good light.
Five shapes, and that is the whole system
Every laundry symbol in use anywhere is one of five basic shapes. Learn the shapes and the modifiers follow.
- Bucket of water → washing
- Triangle → bleaching
- Square → drying
- Iron → ironing
- Circle → professional dry cleaning
Then three modifiers apply to any of them:
- Dots inside a shape mean temperature. More dots, more heat.
- Lines underneath mean gentleness. One line is permanent press, two lines is delicate. No line is normal.
- An X over the shape means do not do this at all.
That is the entire language. Everything below is just applying it.
The bucket: washing
A number inside the bucket is the maximum temperature in Celsius. Dots mean the same thing without the number:
- One dot — 30°C, cold. Most clothing is happiest here.
- Two dots — 40°C, warm.
- Three dots — 50°C, hot. Towels, bedding, underwear.
- A hand in the bucket — hand wash only. Cool water, no agitation.
- Bucket crossed out — do not wash in water at all. Dry clean or spot clean.
The lines underneath are the ones people ignore and should not. One line means reduce agitation; two lines means the machine should barely move. On a modern washer, two lines is the delicate cycle, and using the normal cycle instead is how a knit comes out stretched.
The triangle: bleach
- Empty triangle — any bleach is fine.
- Triangle with two diagonal lines — oxygen bleach only, no chlorine. This is the one on most coloured clothing.
- Triangle crossed out — no bleach of any kind.
Worth knowing the difference: chlorine bleach destroys colour and weakens fibres. Oxygen bleach, the powdered kind, is colour-safe and works slowly in warm water. Most “do not bleach” tags mean “no chlorine” and the oxygen version is fine.
The square: drying
A square on its own is about drying generally. A circle inside the square means a tumble dryer specifically.
- Circle in square, one dot — low heat.
- Two dots — medium.
- Three dots — high.
- Filled-in circle — no heat, air tumble only.
- Circle in square crossed out — no tumble drying. This is the one that shrinks sweaters.
Without the circle, the square tells you how to air dry: a horizontal line means dry flat, a curved line at the top means line dry, three vertical lines means drip dry without wringing. Dry flat matters for knits — hanging a wet wool sweater stretches it permanently under its own weight.
The iron
- One dot — low, around 110°C. Synthetics, which melt.
- Two dots — medium, around 150°C. Wool and blends.
- Three dots — high, around 200°C. Cotton and linen.
- Iron with lines under it crossed out — no steam.
- Iron crossed out — do not iron at all.
The circle: dry cleaning
These are instructions for the cleaner, not for you. The letter inside tells them which solvent. What matters to you is only whether the circle is crossed out, which means do not dry clean — and that is a real instruction, because some finishes dissolve in solvent.
“Dry clean” and “dry clean only” are different. The first is a recommendation. The second is a warning. A lot of “dry clean” cotton and linen hand-washes perfectly well in cold water.
The three that are worth obeying strictly
If you remember nothing else:
- Crossed-out tumble dryer. This is what shrinks wool, cashmere and anything knitted. The damage is immediate and permanent.
- Crossed-out bleach on white. Chlorine on the wrong fibre — silk, wool, spandex, many synthetics — yellows it irreversibly.
- Two lines under the bucket. Delicate means the fabric cannot survive normal agitation. Lace, beading, loose knits.
When the tag is gone
Cut out, faded, or in a language you do not read. Work from the fibre instead:
- Cotton and linen — warm wash, tumble dry low, expect some shrinkage the first time.
- Wool and cashmere — cold hand wash, never the dryer, dry flat.
- Silk — cold, gentle detergent, never bleach, air dry out of sunlight.
- Polyester, nylon, acrylic — cold or warm, low dryer heat. They melt before they burn.
- Rayon and viscose — the troublesome one. Shrinks and loses shape in water. Cold hand wash, dry flat, or genuinely dry clean.
- Anything with spandex — cold, and keep it out of the dryer. Heat kills the stretch, which is the entire reason you bought it.
And the rule that covers every unknown: cold water and air dry is never the thing that ruined a garment. It might not get it as clean. It has never shrunk anything.
