Can You Machine Wash Felt? (One Word, Three Different Fabrics)

Isn’t a washing machine exactly how felt gets made in the first place?

For wool felt, essentially yes. Felt is not woven and not knitted. It is wool that has been matted on purpose under controlled abuse: hot water, alkaline soap, pressure and sustained agitation, until the microscopic scales along each fibre ratchet past their neighbours and lock. Those scales travel in one direction only, which is why the tangle never comes undone. A warm machine cycle supplies all four of those conditions at once. The instinct behind the question is sound.

Where the instinct goes wrong is the outcome. Wool felt does not turn into felt in your machine, because it already is felt. It carries on densifying instead. The sheet gets smaller, thicker, harder and less pliable, and it moves by different amounts in different directions, so a square panel comes back as a slightly bowed rectangle. Felters do this deliberately and call it fulling, running a piece through cycle after cycle until it reaches the density they want. Nothing about the process runs backwards, and there is no wash, stretch or steam that returns shrunk felt to its original size.

The larger complication is that a great deal of what is sold as felt contains no wool whatever. Craft felt from a hobby shop is usually polyester or acrylic, held together by needle-punching rather than by any scale mechanism, and it fails by a completely different route: it pills, ripples, stretches at the edges and glazes under an iron. A third group, rayon and viscose felt, is neither wool nor synthetic: it is wood pulp, needle-punched the same way, and in the one published comparison it behaved worst of the lot. Wool-blend felt belongs mostly to that third group despite its name, since The Felt Store’s premium blend is 40 percent wool and 60 percent viscose. One word, four materials, four separate failure modes.

What you’ll need

The method, step by step

1. Work out which felt you have

   Wool felt is fuzzy, slightly uneven in thickness and expensive. Acrylic and polyester craft felt is smooth, uniform and faintly shiny, and costs a fraction as much. If you need certainty, hold a snippet in tweezers over a sink and light it: wool smells like burnt hair, self-extinguishes and crushes to a brittle ash, while acrylic and polyester melt, drip and leave a hard bead.

   3 min

2. Test a scrap in the water you actually plan to use

   Wet the scrap at your intended temperature, add a drop of the wash, and rub it between your palms for thirty seconds. Wool and wool blends visibly firm up and fuzz. Acrylic and polyester just get wet. This tells you in half a minute what a ruined project would otherwise tell you at the end.

   5 min

3. Measure it flat and write the numbers down

   Length and width, on a flat surface, before anything gets damp. Felt rarely shrinks the same amount along both axes, so a single remembered dimension is not enough to reshape it back afterwards.

   2 min

4. Wash by hand in cool water, moving it as little as possible

   Dissolve the wash into the water first, then lower the felt in and press it gently under. Squeeze the water through the piece rather than rubbing, swirling or scrubbing it. Ten minutes of soaking does more than any amount of handling, and handling is the part that costs you size.

   10 min, mostly soaking

5. Rinse at the same temperature you washed at

   A sharp jump between wash and rinse is a felting trigger in its own right, separate from the agitation. Match the rinse water to the wash water by hand before the felt goes into it, and change the water rather than running a tap over the piece.

   4 min

6. Press the water out through a towel

   Lift the piece as a whole, supporting it from underneath so its own waterlogged weight does not stretch it. Lay it on a dry towel, roll the two together, and press. Never twist or wring.

   3 min

7. Dry flat, in shade, back to the numbers you wrote down

   On a second dry towel or a flat rack, nudged gently back to its measured dimensions while still damp. Away from radiators and direct sun. Hanging wet felt is its own mistake: there is no yarn grid to hold the shape, so the weight of the water simply drags the sheet longer.

   12–24 h

8. Press with a low iron and a cloth if it dried lumpy

   Wool felt often dries slightly bubbled, and a low iron through a pressing cloth flattens it. Keep the setting low whichever felt you have, because polyester glazes into a permanent shiny patch long before it scorches.

   4 min

The four fabrics sold as felt

The word on the shelf label tells you the construction, not the fibre, and the fibre is what decides everything.

That last row is not a footnote: manufacturers split their own ranges on it. Kunin, whose Eco-fi craft felt is polyester made from recycled bottles, publishes a care guide that gives different instructions line by line: its Classics and Premium felt is marked machine wash gentle, gentle dry, no bleach, iron low heat, while its adhesive-backed Presto and its stiffened Friendly Felt are both marked do not wash and do not dry. Same brand, same shelf, opposite instructions.

The felt that shrank most in testing had no wool in it

The Felt Store, a retailer rather than a laboratory, ran its own comparison across four felts: acrylic, rayon and viscose, a premium wool blend, and 100 percent wool. In the worst case they tried, a normal cycle in hot water followed by thirty minutes in a hot dryer, the acrylic moved about a quarter of an inch and picked up some rippling and pilling. The 100 percent wool lost up to an inch. The wool blend lost up to three quarters of an inch. The rayon and viscose felt lost more than an inch on the patch, fuzzed all over its surface, and came out worst of the four. Its purple dye also bled onto the backing fabric, and it did that in nearly every cycle they ran, the cold and hand washes included.

That ordering is not the one most people expect. Wool has the reputation, but the felt that behaved worst in the drum was the one with no wool in it to felt. Treat those inch figures as directional only: the store does not publish the starting dimensions of its test pieces, so there is no honest way to turn them into percentages.

For a figure you can actually scale, the felt supplier Benzie measured a six-inch square of its wool-blend felt before and after a hot pre-wash and got back roughly five and three quarter inches by five and a half. That is about four percent one way and eight percent the other, from a single wash. The uneven part is the point. A square does not come back a smaller square.

Stains on felt, and which ones come out

Felt has a raised, open surface and no smooth face to wipe, so the usual advice about blotting a stain off a fabric only half applies. Spot cleaning beats washing whenever it will do the job, because it keeps the piece out of the water entirely.

Felt with a backing, a stiffener or a shape is a different object

Once felt has been made into something, the felt itself often stops being the fragile part. Check for these before deciding anything, because each one overrides the fibre answer above.

• Felt hats. A wool or fur felt hat is blocked to a shape on a wooden form, and water plus agitation releases that shape permanently. Brush it instead, in short strokes around the crown, and take a hat you care about to a hatter for cleaning and reblocking. Submerging it is not a risk, it is the end of the hat.
• Adhesive-backed felt. Self-adhesive sheets and craft-felt stickers carry a glue layer that water lifts. Kunin marks its own adhesive line do not wash, which is about as clear as a manufacturer gets.
• Stiffened and glittered felt. The stiffener is a resin that washes out and the glitter is glued on. Both come off in the first wash and neither goes back.
• Glued craft pieces. Appliqué and ornaments assembled with fabric glue rather than stitching come apart in water regardless of what the felt itself would tolerate. Stitched pieces are the ones worth washing.

When something is genuinely worth keeping and you cannot tell what is in it, the felt suppliers themselves default to professional cleaning. Both A Child’s Dream and Benzie recommend dry cleaning as the safest route for wool and wool-blend felt, which is a notable position for shops that would rather sell you more felt. If your piece does carry a label, the label decoder will translate the symbols.

Related guides

Felt sits at one end of a family of wool problems. The neighbouring cases work differently:

• Knitted and woven wool has a yarn structure that felt lacks, which changes both the risk and the repair. See how to clean wool.
• The machine question for ordinary wool garments has a more forgiving answer than it does for felt. See can you machine wash wool.
• Felt hats belong with the hat problem rather than the fibre problem, because the shape is the thing you are protecting. See can you machine wash hats.
• For the gentlest end of protein-fibre hand washing, and why drying flat matters so much, see how to clean cashmere.

Questions