How to Restore Quilt Loft

By topquilt.com · Updated Oct 21, 2026 · 5 min read

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Loft is warmth. The thickness of your quilt's insulation determines how much still air it traps, so a quilt that has lost an inch of loft can sleep noticeably colder than its rating. The good news is that you can restore quilt loft in most cases, especially with down. The key is figuring out why it went flat in the first place.

Why quilts lose loft

What you need

• A large tumble dryer with a low-heat setting.
• Dryer balls or clean tennis balls. Wool dryer balls are gentle; tennis balls in clean socks work too.
• Down-specific wash if the quilt needs cleaning: Nikwax Down Wash Direct or Granger's Down Wash.
• A large storage sack to keep loft afterward, such as a breathable cotton storage sack.
• A ruler, if you want to measure loft before and after.

Step 1: Measure the loft you have

Before trying fixes, get a baseline. Lay the quilt flat on a table after it has rested uncompressed for an hour. Lay a light, stiff piece of cardboard on the center and measure from the table to the cardboard. That's single-layer loft for a top quilt. Compare it to the maker's spec if available, keeping in mind that makers measure loft in different ways.

You don't need precision. A measurement just tells you whether each step is actually working.

Step 2: Shake and air it out

1. Grab the quilt by two corners of one end and shake it vigorously, snapping it like a sheet. Repeat from the other end.
2. Massage any lumps apart with your fingers.
3. Lay it flat or drape it over a rack in a dry, warm room for 12–24 hours.
4. Measure again.

If the quilt just came out of a stuff sack or storage, this is often all it needs.

Step 3: Tumble on low heat

A dryer is the most effective tool for restoring loft short of washing. Gentle heat drives out absorbed moisture and the tumbling action separates clusters.

1. Place the quilt in a large dryer with two to four dryer balls.
2. Run on low heat for 20–40 minutes.
3. Take it out, shake it and check for clumps.
4. Repeat once if it's improving but not finished.
5. Let it rest flat for an hour, then measure.

Step 4: Redistribute down in thin chambers

If the quilt is lofty in some places and thin in others, the down has moved rather than disappeared. This is common in quilts with continuous horizontal baffles, which let down travel side to side. Hold the quilt so the thin side is at the bottom and shake down into it, or massage it across. Our full guide on fixing down shifting covers techniques, and quilt baffles explained shows why it happens.

Step 5: Wash it

When fluffing and tumbling don't bring loft back, the culprit is usually body oil and grime. Oils make down clusters stick together so they can't expand. Washing removes them.

Follow our step-by-step guide on how to wash a down quilt, then dry it fully. A careful wash often brings an old, flat quilt back close to its original loft. Make sure you run extra rinse cycles; leftover soap is the most common reason a quilt stays flat after washing.

Restoring loft in a synthetic quilt

Synthetic insulation behaves differently. Continuous-filament insulation like Climashield Apex is resilient but loses some loft each time it's compressed and released, and that loss accumulates over years. Long-term storage in a stuff sack speeds it up.

You can still help a synthetic quilt:

• Shake and air it the same way as down.
• Tumble on the lowest heat or no heat with dryer balls.
• Wash it if dirty, using a technical wash. See washing synthetic quilts.
• Store it uncompressed from now on.

Expect partial recovery. If an old synthetic quilt is much thinner than new and nothing helps, its insulation is worn out. Read Climashield Apex insulation for how this material ages.

How much loft is enough?

Once you've restored as much loft as you can, it helps to know whether it's still enough for your trips. Loft is only one factor in warmth, alongside your sleeping pad, clothing, shelter and personal metabolism, but these rough community guidelines for single-layer top quilt loft are a useful sanity check:

Treat these as ballpark figures, not ratings. Most quilt temperature ratings are set by makers rather than independently tested, and cold sleepers often need more loft than this. Our guide to top quilt temperature ratings explains how ratings are assigned.

Keeping loft long term

• Store loose. Use a large storage sack or hang the quilt. See how to store a quilt.
• Unpack at camp early. Pull the quilt out when you set up so it can loft before bed.
• Don't over-compress. Use a stuff sack sized for the quilt rather than cranking a compression sack down as far as it goes. See how to pack a quilt.
• Manage moisture. Air the quilt in the morning and dry it in town on long trips.
• Sleep clean. Clean sleep clothes reduce oils reaching the down.

When loft can't be restored

Down is remarkably durable, and a well-cared-for down quilt can keep most of its loft for many years. But some cases are beyond home fixes:

• Broken internal baffles letting down pool in a few chambers.
• Significant down loss through a long-ignored hole.
• Badly degraded synthetic fill after years of hard use.

For down quilts, a maker or repair shop may be able to repair baffles or add down. For synthetic quilts, replacement is usually the practical answer. If you're shopping, compare down fill power and look at our best top quilts roundup. If you're still cold even with good loft, the problem might be elsewhere; our guide to why you're cold in your quilt covers pads, drafts and sleep clothing.