Deepshark Bed Gap Filler for King Mattress - Fills Headboard Gap

In this review the Deepshark Bed Gap Filler for King Mattress is assessed as a practical solution for anyone losing pillows, remotes or small items into the headboard gap. The bottom line: it is for people who want a simple, removable filler that restores a continuous mattress surface and keeps items from falling into the gap. The single biggest reason to buy is the variety of sizes and the firm, high-density 45D sponge that resists collapse and holds pillows in place.

Key Features

• Broader Size Selection: Available to fit common mattress widths including 39in, 54in, 60in and 78in so it can match Twin through King beds and bridge most headboard gaps.
• High-Density Sponge: Filled with 45D high-resilience sponge that provides firm support and resists flattening over time for a reliable barrier.
• Wide Application Range: Designed for the gap between mattress and headboard but also works as a mattress extender, wall-edge filler or between two mattresses for a smoother sleep surface.
• Removable Washable Cover: The breathable linen cover has a durable zipper and can be removed for machine washing or tumble drying on low to keep the bed tidy.
• Compact Shipping: The filler ships compressed and requires 48-72 hours to fully expand, so the product recovers its shape after unpacking.

Who It's For

This product is best for homeowners and renters who have a noticeable gap at the head of the bed and want an affordable, non-permanent solution that keeps small items and pets from falling through. It is also useful for those who need a mattress extender to join two mattresses together or to create a wider sleeping surface.

People who should look elsewhere include those who need a precisely custom-cut foam insert without any expansion period or shoppers expecting an already fully expanded product out of the box. Also, if you require memory foam that contours slowly to body heat rather than a firmer, high-resilience sponge, another material may be a better fit.

Pros & Cons

Pros

• Firm, high-density 45D sponge that keeps pillows and remotes on the bed and provides lasting support.
• Multiple size options so most standard mattress widths can be matched for a snug fit.
• Removable linen cover with a zipper makes cleaning straightforward and the fabric feels breathable.

Cons

• Arrives compressed and can take 48-72 hours to fully expand, which may be inconvenient for some buyers.
• Some customers reported size or expansion issues, so double-check measurements before ordering.

Specifications

Brand	DEEPSHARK
Intended Mattress Sizes	Twin / Twin XL / Full / Queen / King (includes 39in, 54in, 60in, 78in options)
Filling	High-density 45D sponge
Cover Material	Breathable linen fabric, removable with zipper
Care	Removable cover; tumble dry low or air dry
Expansion Time	Approximately 48 to 72 hours after unpacking

Our Verdict

The Deepshark bed gap filler is a sensible, value-focused fix for gaps at the headboard that keeps items from falling and creates a wider sleeping surface. With a firm 45D sponge core and multiple size choices it suits most standard beds; buyers should allow time for full expansion and confirm their measurements before purchase.

Frequently Asked Questions

How long does it take to expand after unpacking?
The foam is compressed for shipping and typically needs 48-72 hours to fully expand to its intended shape.

Can the cover be washed?
Yes, the linen cover is removable via a zipper and can be machine washed; tumble dry on low or air dry is recommended.

Will it work between two mattresses?
Yes, it is designed to fill gaps between two mattresses as well as between a mattress and headboard or wall edge.