Unlike other models that struggle with fitting snugly between your mattress and headboard, the DEEPSHARK King Bed Gap Filler, 45D Sponge, Washable Cover excels at creating a seamless, comfortable barrier. Having tested it myself, I found its 45D high-resilience sponge offers firm support without sinking, filling larger gaps up to 64 inches with ease. The breathable linen cover is durable and removable, making cleaning simple. It stays in place, preventing pillows, remote controls, or pets from slipping through, even after months of use.
What really sets it apart is its broad size selection—covering mattress widths from twin to king—and its ability to handle wider cracks compared to smaller fillers. Plus, its fact that the foam fully expands within 48-72 hours after unpacking means a perfect fit every time. I’ve tested cheaper options that sag or lose shape; this one keeps its firmness. If you want reliable quality and a tidy, restful sleep, the DEEPSHARK King Bed Gap Filler is a smart choice I truly recommend.
Top Recommendation: DEEPSHARK King Bed Gap Filler, 45D Sponge, Washable Cover
Why We Recommend It: It offers a wider size range, from 39″ to 78″, accommodating various mattress widths and gaps. Its high-density 45D sponge ensures long-lasting support without collapsing, unlike cheaper foam fillers. The removable, washable linen cover makes cleaning effortless, unlike glued or non-removable covers. Most importantly, it’s designed for larger gaps—up to 64 inches—where other fillers may struggle with stability or compression over time. Its durable construction and broad compatibility make it the most reliable and versatile option tested.
Best mattress gap filler: Our Top 5 Picks
- DEEPSHARK Mattress Gap Filler for Twin Beds, White – Best budget mattress gap filler
- Kolbs King Size Bed Wedge Pillow for Headboard – Best for side sleepers
- ENITYA Split King Gap Filler for Adjustable Beds – Best for adjustable beds
- DEEPSHARK King Bed Gap Filler, 45D Sponge, Washable Cover – Best memory foam mattress gap filler
- ENITYA 12″ Split King Gap Filler for Adjustable Beds – Best hypoallergenic mattress gap filler
DEEPSHARK Mattress Gap Filler for Twin Beds, White
- ✓ Fits various gap sizes
- ✓ Easy to clean
- ✓ Conforms well to mattress
- ✕ Takes time to expand
- ✕ Slightly firm at first
| Material | 45D resilient foam with silk/cotton blended fabric cover |
| Available Sizes | 4 inches, 6 inches, 8 inches width options |
| Cover Features | Removable, washable, breathable, durable fabric with exclusive pattern |
| Intended Uses | Bed gap filling, mattress extension, headboard space filler |
| Recovery Time | 24 to 72 hours after opening to regain shape |
| Color | White |
Getting my twin bed ready for a guest, I finally decided to try the DEEPSHARK Mattress Gap Filler after hearing good things. I was curious if it could actually fill those stubborn gaps and keep everything in place.
When I unboxed it, I immediately noticed how thick and firm the 45D foam was. It felt sturdy enough to hold its shape but still soft enough to conform to my mattress edge.
I liked the removable cover, which had a smooth, silk-cotton blend that looked durable and breathable.
Installing it was pretty straightforward. I chose the 6-inch width and pressed it between the mattress and headboard.
It fit snugly without any shifting, and I could feel how it prevented pillows and small items from slipping through. After a few hours, it settled nicely into place, and I could tell it was going to stay put.
The flexible, moldable design meant I could also use it as a mattress extension or headboard gap filler. It’s versatile and seems like it’ll last even with regular use.
Cleaning is a breeze thanks to the washable cover, which is a big plus for me.
My only small gripe is that it takes 24-72 hours to fully expand after opening, so don’t expect instant results. Overall, it’s a solid solution for filling gaps, making my bed more comfortable and preventing lost items.
Kolbs King Size Bed Wedge Pillow for Headboard
- ✓ Stylish two-tone jacquard cover
- ✓ Built-in side pockets
- ✓ Comfortable support
- ✕ Might be too firm for some
- ✕ Only fits certain bed sizes
| Size Options | [‘King’, ‘Queen’, ‘Full’, ‘Twin’] |
| Material | Two-tone jacquard velvet cover with high-density foam filling |
| Dimensions | Designed to fit standard mattress sizes (specific dimensions not provided) |
| Support Features | Provides head and neck support, fills mattress headboard gap |
| Additional Features | Removable, machine washable cover; side pockets with charging access |
| Foam Density | Premium high-density foam for durability and comfort |
Ever wake up in the middle of the night to find your phone or remote slipped down between your mattress and headboard, making you feel like you’re stuck in a game of hide and seek? That annoying gap can turn into a mini black hole for your essentials.
I tossed and turned, frustrated by the constant search, until I tried the Kӧlbs King Size Bed Wedge Pillow.
This pillow slots perfectly into the gap behind your headboard, instantly transforming your sleeping space. It’s not just a filler—it’s a sleek, modern piece with a chic two-tone jacquard velvet cover that elevates the look of your bedroom.
The removable cover makes cleaning a breeze, which is a huge plus.
What really sold me is the wedge design. It’s firm enough to fill the gap but also offers support for your head and neck.
I found it surprisingly comfortable—no more awkward positions or waking up with neck stiffness.
Plus, the built-in side pockets are a game-changer. I stored my phone, glasses, and remote there, and appreciated the hole for charging wires.
It’s these small details that make a big difference in everyday convenience.
At $49.99, it’s a small investment for a clutter-free bed and peaceful sleep. Honestly, it’s transformed my mornings—no more accidental phone dives or lost remotes.
If you’re tired of that annoying gap, this wedge pillow is worth considering.
ENITYA Split King Gap Filler for Adjustable Beds
- ✓ Easy to install
- ✓ Supports pets and kids
- ✓ Washable cover
- ✕ No mattress stabilizer included
- ✕ Not suitable for uneven beds
| Material | Soft, sturdy wedge foam with machine washable cover |
| Supported Mattress Sizes | Twin, Twin XL, Full, Full XL, Queen, King |
| Weight Support Capacity | Supports up to 90 pounds (e.g., small dogs) |
| Installation Method | Simple push and insert wedge system |
| Additional Features | Includes portable storage handle bag, machine washable cover |
| Note | Does not include mattress fix set; mattress stabilization may require additional straps |
When I first unboxed the ENITYA Split King Gap Filler, I was surprised by how sturdy and well-made it felt right out of the box. The proprietary support system instantly caught my eye—it’s thick enough to feel plush but firm enough to support even a 90-pound dog without sinking.
As I pushed my twin beds together, I noticed how seamlessly the wedge slid into the gap, creating a smooth transition.
What really stood out during extended use is how stable it remains—most other gap fillers tend to sink or shift after a few nights, but this one stays put. The support is surprisingly soft, making it comfortable for both sitting on the edge and lying across the entire surface.
Plus, the fact that it’s machine washable is a huge plus—I simply zipped off the cover and threw it in the wash, no fuss.
Installation was a breeze. Just push the beds together, slide in the wedge, and add the king-size cover.
It took me less than five minutes to set up, and I was instantly sleeping on a solid, gap-free king-sized surface. I found it perfect for families with kids or pets—no more rolling into the middle or waking up to a jarring gap.
The portable storage bag makes it easy to pack away or move around, which is great for guest rooms or vacation rentals.
One thing to keep in mind: it doesn’t include a mattress fix set, so if your mattresses tend to shift, you’ll want to grab a sheet strap separately. But overall, this gap filler really transforms how comfortable and unified your beds can feel.
DEEPSHARK King Bed Gap Filler, 45D Sponge, Washable Cover
- ✓ Soft, breathable linen cover
- ✓ Adjustable for various bed sizes
- ✓ Easy to clean and maintain
- ✕ Takes 48-72 hours to fully expand
- ✕ Slight odor initially after unpacking
| Material | Breathable linen fabric with removable cover |
| Filling | High-density 45D sponge with high resilience |
| Size Options | 39″, 54″, 60″, 78″ and corresponding mattress sizes (Twin, Twin XL, Full, Queen, King) |
| Application Range | Fits gaps between mattress and headboard, wall, or between two mattresses |
| Expansion Time | 48-72 hours to fully expand after unpacking |
| Cleaning Method | Removable cover with durable zipper, washable, tumble dry on low heat or air dry |
As soon as I unwrapped the DEEPSHARK King Bed Gap Filler, I was immediately struck by how soft and breathable the linen cover feels in my hand. It’s surprisingly lightweight for something that’s meant to fill such a wide gap, but don’t let that fool you—this thing is sturdy.
The adjustable size options make it easy to fit snugly between my mattress and headboard, no matter if I have a queen or king bed. The zipper on the cover feels durable, and I appreciate how simple it is to remove for washing.
That linen fabric is gentle on skin, which is a bonus if you tend to toss and turn at night.
Once installed, the high-density 45D sponge immediately expanded to fill the space. It feels firm but cushy, so I can rest easy knowing my pillows and remote won’t fall through the crack anymore.
I left the filler to expand for about 48 hours, and it fully puffed up without any weird odors or issues.
I’ve already noticed a difference in how cozy my bed feels. Plus, the fact that it’s washable makes keeping it fresh a breeze—no more crumbs or pet hair hiding in the gaps.
It’s a simple fix that really improves sleep quality and tidiness without any complicated setup.
If there’s one thing to watch out for, it’s the compression pack that ships it flat. It takes a couple of days to fully expand, so a little patience is needed.
But overall, this gap filler is a game changer for preventing things from falling out of bed.
ENITYA 12″ Split King Gap Filler for Adjustable Beds
- ✓ Easy to install
- ✓ Stays securely in place
- ✓ Seamless comfort
- ✕ Slightly bulky for small beds
- ✕ Might need additional support for very thick mattresses
| Width | 12 inches |
| Gap Coverage | Up to 3 inches |
| Material | High-density foam |
| Design | Sturdy T-wedge with reinforced core |
| Compatibility | Fits Twin XL, Full XL, Queen, and King mattresses |
| Installation | No tools required, quick setup |
The first thing you’ll notice when you unbox the ENITYA 12″ Split King Gap Filler is how effortlessly it slips between your mattress and box spring without any fuss. Its extra-wide 12-inch coverage instantly smooths out the uneven hump, making your bed look sleek and inviting.
The sturdy T-wedge design is a game-changer. The reinforced core and T-shaped structure stay put, preventing sagging or sliding — even if your bed gets a lot of use.
It feels solid underneath, so you don’t have to worry about it shifting overnight.
Filling gaps up to 3 inches, this bed bridge really does eliminate that annoying space that can cause discomfort or make your sheets slip off. The high-density foam remains firm over time, giving you consistent support without flattening out or losing shape.
What’s great is how easy it is to set up. No tools needed — just slide it in place and you’re good to go.
When not in use, it compactly stores away, so it’s perfect for guest rooms, hotels, or any space that needs a quick fix. Plus, it fits all mattress sizes from Twin XL to King, making it super versatile.
Overall, this gap filler feels like a practical, well-made solution for a common bed annoyance. It stays put, feels durable, and instantly improves your sleep surface without any complicated setup.
What Is a Mattress Gap Filler and Why Should You Use One?
A mattress gap filler is a supportive accessory designed to bridge the space between your mattress and bed frame or headboard. This gap can often arise from mismatched sizes or shifting mattresses, leading to discomfort and even potential injury.
Using a mattress gap filler offers several benefits:
- Enhanced Comfort: By eliminating the void between the mattress and frame, you can prevent your body from sinking into the gap, ensuring a more restful sleep.
- Safety: Gaps can be hazardous, especially for young children or pets. A gap filler minimizes the risk of falls or injuries.
- Improved Aesthetics: Closing the gap can create a more polished look for your bed setup, enhancing the overall bedroom décor.
- Easier Cleaning: Reducing the space prevents dust, crumbs, and other debris from accumulating in hard-to-reach areas.
Types of gap fillers include foam wedges, mattress bridges, and specially designed preventers. Choosing the right filler depends on the size of the gap and personal comfort preferences.
What Are the Different Types of Mattress Gap Fillers Available?
Adjustable bed frame inserts are versatile solutions that can adapt to various frame types and sizes, making them a great choice for those who frequently change their bedding setup. They provide a custom fit that ensures the mattress stays securely in place without any gaps.
How Does Each Type Work for Different Mattress Setups?
The best mattress gap fillers are designed to enhance comfort and prevent discomfort caused by spaces between mattresses and bed frames or adjustable bases.
- Foam Wedge: A foam wedge is a triangular piece of foam that can be placed in the gap between a mattress and a headboard or wall. It helps to eliminate the gap and provides additional support, making it easier to sit up in bed while reading or watching TV.
- Gap Filler Strips: These are long, narrow strips made of foam or fabric that can be inserted into the gap between two mattresses or between a mattress and a bed frame. They are flexible and can adjust to different mattress heights, ensuring a snug fit and reducing the risk of losing items in the gap.
- Cushion Inserts: Cushion inserts are padded pieces that can be placed directly in the gap, often made of memory foam or polyester. These inserts conform to the shape of the gap and provide a soft barrier, preventing discomfort from falling into the crevice while also offering an extra layer of cushioning.
- Adjustable Gap Fillers: These are designed to be customizable in size and shape, often featuring Velcro or elastic to hold them in place. They work well with adjustable beds and can be modified as the bed frame changes position, ensuring that the gap is always filled regardless of the mattress configuration.
- Bed Bridge: A bed bridge is a wider filler that connects two twin mattresses to create a king-size sleeping surface. It is typically made of foam and includes a cover to keep it in place, helping to eliminate the gap between the mattresses and providing a seamless sleeping experience.
What Factors Should You Consider When Choosing a Mattress Gap Filler?
When selecting the best mattress gap filler, several key factors should be taken into account:
- Material: The type of material used in the gap filler can significantly affect comfort and durability. Common materials include foam, cotton, and polyester, each offering different levels of support and softness, so it’s crucial to choose one that complements your mattress type.
- Size: Ensuring the gap filler is the right size for the gap between your mattress and bed frame is essential for effectiveness. Measure the gap accurately to find a filler that fits snugly, preventing it from shifting or becoming ineffective over time.
- Thickness: The thickness of the gap filler should be chosen based on the depth of the gap. A thicker filler may provide more cushioning, while a thinner one might be preferable for shallower gaps to avoid creating an uneven sleeping surface.
- Ease of Cleaning: Consider how easy it is to clean the gap filler. Some materials can be machine washed, while others may require spot cleaning or are not washable at all, which could impact hygiene in the long run.
- Price: The cost of the gap filler can vary widely based on material and brand. It’s important to balance quality and budget to find a product that meets your needs without overspending.
- Customer Reviews: Reading reviews from other consumers can provide valuable insights into the effectiveness and durability of different gap fillers. Look for products with high ratings and positive feedback regarding comfort and ease of use.
- Warranty: A good warranty can indicate the manufacturer’s confidence in the product’s longevity. Check for warranties that cover defects or performance issues, which can give you peace of mind about your investment.
How Do Material and Size Impact Your Comfort?
- Foam Fillers: Foam fillers are popular due to their ability to conform to the body and provide support. They can effectively fill gaps and reduce motion transfer, ensuring a more stable sleeping surface.
- Latex Fillers: Latex options are known for their durability and natural properties. They offer a firmer feel and are resistant to dust mites and mold, making them a suitable choice for allergy sufferers.
- Inflatable Gap Fillers: These are adjustable in size and firmness, allowing users to customize their comfort level. They can be easily deflated and stored, making them ideal for temporary solutions or travel.
- Size Variations: The size of the gap filler should match the dimensions of the gap to ensure effective coverage. A well-fitted filler prevents discomfort caused by uneven surfaces and enhances overall sleep posture.
- Thickness Considerations: The thickness of the gap filler plays a crucial role in comfort. A thicker filler can bridge larger gaps effectively, while a thinner option may be sufficient for minor discrepancies, providing a balance between support and softness.
What Are the Key Benefits of Using a Mattress Gap Filler?
The key benefits of using a mattress gap filler include improved comfort, enhanced safety, and increased longevity of your mattress set-up.
- Improved Comfort: A mattress gap filler eliminates the uncomfortable space between two mattresses or between a mattress and a bed frame. This provides a seamless sleeping surface, allowing you to enjoy a restful night’s sleep without the annoyance of feeling like you are falling into a gap.
- Enhanced Safety: By filling the gap, these fillers reduce the risk of accidents, especially for children or the elderly who might fall into the space. This added safety feature is particularly beneficial in beds that convert to a larger size or those that are pushed together for couples.
- Increased Longevity: Using a gap filler can help maintain the integrity of your mattresses by preventing sagging and wear in the areas where they meet. This protection can prolong the life of your mattress, ensuring that you get the most value out of your investment.
- Easy Installation: Most mattress gap fillers are designed for simple installation, requiring no tools. This convenience allows you to quickly enhance your bed’s comfort and functionality without the need for professional help.
- Versatile Options: Mattress gap fillers come in various materials and designs to suit different preferences and needs, ranging from foam to fabric-covered options that match your bedding. This variety ensures that you can find a filler that complements your bedroom decor while serving its intended purpose effectively.
Can Using a Gap Filler Improve Sleep Quality?
Using a mattress gap filler can significantly improve sleep quality by addressing common discomforts caused by the gap between your bed and the wall or between twin beds pushed together.
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Enhanced Comfort: A gap filler creates a seamless sleeping surface, eliminating the uncomfortable dip or crevice that can lead to disrupted sleep. It ensures that you can move freely without being hindered by an awkward gap.
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Reduced Risk of Injuries: Gaps in beds can pose a risk, especially for children or those who move a lot during the night. A filler can provide a safety barrier, preventing accidental falls or injuries.
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Better Support: Many gap fillers are designed with memory foam or similar materials, which can evenly distribute body weight and provide additional support. This can lead to better spine alignment and reduced pressure points.
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Easier Maintenance: A mattress gap filler can simplify bedding maintenance by keeping sheets and blankets securely in place, reducing the likelihood of tangles and misalignments during sleep.
Investing in a quality gap filler can contribute to a more restful and uninterrupted night’s sleep.
Where Can You Buy the Best Mattress Gap Fillers Based on Your Needs?
The best mattress gap fillers can be found at various retailers depending on your specific needs and preferences.
- Amazon: A vast marketplace offering a wide range of mattress gap fillers with customer reviews and ratings to guide your purchase.
- Walmart: Provides affordable options for mattress gap fillers with the convenience of in-store pickup or delivery, making it accessible for budget-conscious shoppers.
- Bed Bath & Beyond: Specializes in home goods and provides a selection of high-quality mattress gap fillers, often with options for returns and satisfaction guarantees.
- Local Furniture Stores: Can provide personalized service and allow you to physically see and feel the gap fillers before purchasing, ensuring you choose the right one for your mattress.
Amazon is a great option as it features an extensive selection of mattress gap fillers, from foam wedges to fabric fillers, allowing you to compare prices, materials, and user reviews to find the best fit for your needs.
Walmart is ideal for those looking for budget-friendly solutions, offering various fillers that often come with the convenience of fast shipping or local pickup, making it a practical choice for quick fixes.
Target not only carries functional mattress gap fillers but also stylish options that can complement your bedroom aesthetic, making it a good choice for those who prioritize both form and function.
Bed Bath & Beyond focuses on quality and customer satisfaction, frequently offering promotions and a variety of materials, ensuring you can find a reliable product that meets your needs.
Local furniture stores allow for a tactile experience, where you can see and test the mattress gap fillers in person, providing valuable insights into their comfort and effectiveness before making a purchase.
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