Ranked on loft per dollar for people who already own covers and only need the inside fixed.
The Best Throw Pillow Inserts (2026)
The best throw pillow inserts for making existing covers look full: down alternative, virgin microfiber, extra-fill, and real down compared.
Our top picks at a glance
Best overall inserts
Utopia Bedding Throw Pillow Inserts, Set of 4, 18x18 Inch, WhiteAnyone refreshing a sofa or bed with existing 18 inch covers who wants four full inserts for the price of one designer pillow.
Best hypoallergenic inserts
Phantoscope 100% Virgin Fiber Pillow Inserts, Pack of 4, 18x18 InchHouseholds that want feather-free inserts in bulk, especially where allergies rule out down.
Best extra-fill pair
CGK Unlimited Throw Pillow Inserts, Set of 2, 18x18 Inch, WhiteAnyone with two 18 inch covers that look underfilled, or a pair of chairs that needs matching inserts.
For most covers, buy the Utopia Bedding set of 4: 500 grams of fill per insert is enough to make a cover look stuffed, not slack. Allergy-prone homes should take the Phantoscope virgin fiber four-pack instead, and down lovers should take the MIULEE goose down pair for a chair they sit in every day.
The picks, ranked
| Pick | Size | Pack | Fill | Buy |
|---|---|---|---|---|
| Best overall insertsUtopia Bedding Throw Pillow Inserts, Set of 4, 18x18 Inch, White | 18 x 18 inches each | Set of 4 inserts, covers not included | 500 g polyester microfiber per insert | Check price |
| Best hypoallergenic insertsPhantoscope 100% Virgin Fiber Pillow Inserts, Pack of 4, 18x18 Inch | 18 x 18 inches each | Pack of 4 inserts, covers not included | 100% virgin polyester microfiber | Check price |
| Best extra-fill pairCGK Unlimited Throw Pillow Inserts, Set of 2, 18x18 Inch, White | 18 x 18 inches each | Set of 2 inserts, covers not included | Down alternative polyester, 10% more fill than standard loft | Check price |
 Best real down insertsMIULEE Goose Feather Down Pillow Inserts, Set of 2, 18x18 Inch, White | 18 x 18 inches each | Set of 2 inserts with fill included | Goose feather down | Check price |
Best overall inserts
Utopia Bedding Throw Pillow Inserts, Set of 4, 18x18 Inch, White
The four-pack insert that makes tired covers look new again: 500 grams of fill in each 18 inch square.
500 grams of fill per insert at a four-pack price makes this the default insert buy. Covers sit full, and one order dresses a sofa.
Strengths
- Each insert carries 500 grams of polyester microfiber fill, which is more than a standard insert, so covers sit full rather than slack.
- Four inserts in one pack covers a standard sofa in a single purchase, with no need to mix batches.
- The brushed fabric shell is soft to handle while you stuff covers, and the fill bounces back after being pressed.
Limitations
- These are inserts only, so you still need 18 inch covers to use them as finished pillows.
- They arrive vacuum packed and need a day of fluffing before they reach full loft.
- White shells show through pale or sheer covers, so they suit opaque fabrics best.
What owners report
Commonly praised
- Covers sit noticeably fuller once these inserts go in
- four matching inserts dress a whole sofa in one order
- fill springs back after a day of sitting
Common complaints
- Vacuum packing means a wait before full loft appears
- white shells can show through thin pale covers
- inserts alone leave buyers still needing covers
Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.
| Size | 18 x 18 inches each |
|---|---|
| Pack | Set of 4 inserts, covers not included |
| Fill | 500 g polyester microfiber per insert |
| Fill type | Down alternative |
| Cover fabric | 115 GSM brushed fabric |
| Use | Indoor and outdoor |
Best for: Anyone refreshing a sofa or bed with existing 18 inch covers who wants four full inserts for the price of one designer pillow.
Skip if: You need the covers as well, or you want real feather down instead of a down alternative fill.
Best hypoallergenic inserts
Phantoscope 100% Virgin Fiber Pillow Inserts, Pack of 4, 18x18 Inch
A hypoallergenic four-pack for allergy-prone homes: virgin microfiber fill with no feathers anywhere in it.
Virgin microfiber with no feathers, in a four-pack that keeps every seat matching. The pick for allergy-prone homes.
Strengths
- The fill is 100 percent virgin polyester microfiber, so there are no feathers to poke through a cover or trigger a down allergy.
- Four matching inserts keep a sofa set consistent, with the same loft on every seat.
- The square form holds its corners, which helps covers keep a neat tailored shape.
Limitations
- Inserts only, so covers must be bought separately.
- Microfiber fill feels springy rather than soft and sinking, which some people find less cosy than down.
- Vacuum packing means the inserts need fluffing and time before they look their best.
What owners report
Commonly praised
- Feather-free fill suits homes that avoid down
- square form keeps covers looking neat at the corners
- four-pack keeps every seat at the same loft
Common complaints
- Loft feels springy rather than soft and sinking
- needs fluffing after unpacking before it looks its best
- no stated fill weight to compare against rivals
Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.
| Size | 18 x 18 inches each |
|---|---|
| Pack | Pack of 4 inserts, covers not included |
| Fill | 100% virgin polyester microfiber |
| Cover material | Polyester |
| Allergy note | Hypoallergenic, feather-free |
Best for: Households that want feather-free inserts in bulk, especially where allergies rule out down.
Skip if: You want a single finished pillow, or you prefer the heavier drape of a feather insert.
Best extra-fill pair
CGK Unlimited Throw Pillow Inserts, Set of 2, 18x18 Inch, White
The extra-fill pair: two plump inserts with more fill than a standard loft, for covers that need to look stuffed.
Extra fill rescues covers that look underfilled, and the pair is machine washable. Buy it when only two covers need help.
Strengths
- The listing describes 10 percent more fill than a standard loft, so covers sit plump instead of sagging at the corners.
- Down alternative polyester fill is hypoallergenic and machine washable, which suits households that wash bedding often.
- Two is the right count for a pair of armchairs or for testing a fill before committing to a full sofa set.
Limitations
- Only two inserts, so a three-seat sofa needs a second pack.
- Extra fill makes the insert firmer than a soft down pillow, which some people find too upright for leaning on.
- They arrive compressed and need fluffing before first use.
What owners report
Commonly praised
- Extra fill makes underfilled covers look stuffed again
- machine washable care suits frequent washing
- pair is the right count for two armchairs
Common complaints
- Only two inserts, so a full sofa needs a second pack
- firmer feel than a soft down pillow
- arrives compressed and needs fluffing first
Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.
| Size | 18 x 18 inches each |
|---|---|
| Pack | Set of 2 inserts, covers not included |
| Fill | Down alternative polyester, 10% more fill than standard loft |
| Allergy note | Hypoallergenic |
| Care | Machine washable |
Best for: Anyone with two 18 inch covers that look underfilled, or a pair of chairs that needs matching inserts.
Skip if: You need four inserts for a full sofa, or you want real down.
Best real down inserts
MIULEE Goose Feather Down Pillow Inserts, Set of 2, 18x18 Inch, White
Real goose down in a cotton shell: the pair for people who want a pillow that can be karate-chopped into shape.
Goose down moulds and holds its shape in a way synthetics imitate but never quite match. The premium feel pick for a favourite chair.
Strengths
- Goose feather down fill moulds around you and springs back when fluffed, which is the feel synthetic fills imitate.
- The 100 percent down-proof cotton cover is made to keep feathers inside, with navy piping that gives the insert a finished edge.
- Two inserts suit a pair of chairs or the ends of a sofa, where a matching pair matters most.
Limitations
- Real down is not hypoallergenic, so allergy-prone households should choose a microfiber insert instead.
- Down needs regular fluffing to keep its loft, and it goes flat faster than a dense synthetic fill if it is sat on daily.
- A stray feather can still work through the seam over time, which is normal for down but worth knowing.
What owners report
Commonly praised
- Down moulds around you in a way synthetics do not
- cotton shell with navy piping looks finished even without a cover
- pair suits two chairs or the ends of a sofa
Common complaints
- Needs regular fluffing to hold its loft
- not suitable for anyone with a down allergy
- stray feathers can work through the seam over time
Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.
| Size | 18 x 18 inches each |
|---|---|
| Pack | Set of 2 inserts with fill included |
| Fill | Goose feather down |
| Cover | 100% down-proof cotton |
| Colour | White with navy piping |
Best for: Buyers who want the soft, mouldable feel only real down gives, for a reading chair or a bed that gets daily use.
Skip if: Anyone with a feather or down allergy, or anyone who wants a machine-washable insert with no special care.
Questions, answered
What size insert fits an 18 inch cover?
An 18 inch insert fits, but a 20 inch insert in an 18 inch cover looks fuller, with plumper corners. The inserts here are 18 inch, which suits covers that already fit snugly or covers you want to keep soft rather than drum-tight.
Down or down alternative?
Down moulds, breathes, and holds a chop, but it needs fluffing and it is not hypoallergenic. Down alternative is washable, allergy friendly, and cheaper, but it feels springier and less sinking. Choose by allergy first, then by feel.
How do I fluff a vacuum packed insert?
Open it, pull the corners out by hand, and punch the centre a few times to break up the compressed fill. Leave it overnight, and it should reach close to full loft by the next day.