How to Dry Pillows: The Right Way by Fill Type

The key is one thing: dry pillows completely, all the way through. A pillow that is damp at the core grows mildew fast, and you will not notice until the smell hits you.

Low heat, plenty of time, and dryer balls to prevent clumping. That is the formula for most fills.

The exception is memory foam. Tumble heat damages it. Air dry only.

Here is how to handle each fill type and how to know when the job is actually done.

Why incomplete drying is the real problem

Pillows hold a lot of moisture. The fill is thick, and the center takes far longer to dry than the surface.

Pull a pillow out of the dryer, feel the outside, and it can feel dry while the core is still damp.

Mildew grows in that trapped moisture. Dust mites follow. The pillow starts to smell, and washing it again will not fix the problem if you dry it the same way again.

Getting the pillow fully dry is the whole game. Everything else is just method.

Drying by fill type

Polyester and down alternative

These are the easiest fills to dry and the most forgiving.

• Tumble dry on low heat.
• Add two or three wool dryer balls to the drum. They beat the fill back into shape as it dries and stop it from packing into lumps.
• Expect one to two hours, maybe longer for a thick pillow.
• Every 30 minutes, pull the pillow out and give it a firm shake to redistribute the fill.
• Keep running until the entire pillow is dry, not just the surface.

Tennis balls do the same job as dryer balls in a pinch. Wrap them in a sock so the seams do not leave marks.

Down and feather

Down needs the same low-heat tumble method, but takes longer because the clusters trap air and moisture.

• Use low heat only. High heat can damage the delicate down clusters.
• Dryer balls are essential here. Without them, down mats into solid lumps that are nearly impossible to break up.
• Plan for two to three hours at minimum.
• Pull the pillow out and manually break up any clumps you feel before each new cycle.

When down is dry, the pillow will feel light and lofted again, not flat or heavy. A heavy feel means moisture is still inside.

If you are washing down pillows for the first time, see the full guide on how to machine wash down pillows before you start.

Memory foam

Memory foam cannot go in a tumble dryer.

Heat breaks down foam. It collapses the cell structure, and the pillow loses its support. There is no reversing it.

Air drying is the only option.

• Gently press out as much water as you can by hand. Do not wring or twist.
• Lay the pillow flat on a clean rack or towel.
• Put it in a warm, well-ventilated room, or outside in the shade.
• Flip it every few hours so both sides dry evenly.
• Allow at least 24 hours, sometimes 48 for a thick piece.

Solid foam takes a long time, and rushing it causes the mildew problem. The full process for cleaning foam is covered in the guide on how to wash memory foam pillows.

Cotton fill

Cotton fill can be tumble dried on low heat, similar to polyester.

• Use low heat to avoid shrinkage.
• Dryer balls help break up any clumping.
• Check the care label first. Some cotton-fill pillows recommend air drying only.
• Cotton holds more moisture than synthetic fill, so give it extra time.

Body pillows

Body pillows are long and take up most of a standard dryer.

• Check that your dryer is large enough for the pillow to move freely. A pillow jammed against the drum wall does not dry evenly.
• If the pillow is too long for the dryer, air dry it flat and flip it regularly.
• See the full guide on how to wash body pillows for washing steps before drying.

Air drying: when to use it and how

Air drying is the right choice for memory foam, oversized pillows, and any fill the care tag says not to tumble.

It takes longer, but it works. The steps are simple:

1. Press out surface moisture with a clean towel.
2. Lay the pillow on a flat rack so air can circulate underneath.
3. Put it somewhere warm with good airflow: an outdoor clothesline, a breezy room, or near an open window.
4. Flip the pillow every couple of hours.
5. Do not rush it back onto the bed.

Direct sunlight can bleach the cover fabric. Shade with a breeze is the better option outdoors.

How to tell when a pillow is truly dry

The surface test is not enough.

Press your hand firmly into the center of the pillow. It should feel light and warm, not cool or heavy. Any trace of heaviness means moisture is still inside.

For down and feathers: a dry pillow feels noticeably lofted and springy, not flat.

For foam: bend a corner gently and hold it near your face. If you feel any coolness or catch a faint damp smell, it is not done.

When in doubt, give it another cycle or another few hours in the air. An extra hour of drying costs nothing. Mildew costs a new pillow.

Preventing mildew and clumping

A few habits make the whole process easier:

• Dry at the right heat for the fill. High heat is the most common mistake and it causes packing, damage, and sometimes shrinkage.
• Use dryer balls for any fill that goes in the tumble dryer. A single pillow bouncing alone in the drum will clump.
• Never store a pillow until it is fully dry, all the way to the core.
• Use a pillow protector between the pillow and the pillowcase. It absorbs sweat before it reaches the fill and means less frequent washing.

The bottom line

Drying pillows correctly comes down to the fill.

Polyester, down alternative, and cotton: tumble on low heat with dryer balls, and run it long enough to dry the core.

Down and feather: same method, more time, break up lumps by hand.

Memory foam: air dry only, flat, 24 to 48 hours. No heat.

The real risk is not the drying method. It is calling the pillow done before the middle has caught up with the outside. Check the center before you put it back on the bed.