The Best King Size Mattress Cover

Your mattress is one of the most important investments for a good night’s sleep. A king size mattress cover not only protects that investment from spills, dust mites, and wear but also can add a layer of comfort or cooling.

Whether you need a waterproof protector for a child’s bed, a plush pad to soften a firm mattress, or a complete encasement for allergy relief, choosing the right cover makes a real difference.

We’ve evaluated a wide range of the best king size mattress covers on the market, analyzing specifications, expert review consensus, and verified buyer feedback to help you find the perfect match for your sleep setup.

Below, we highlight our top picks to simplify your decision.

BestProducts independently researches and evaluates every product we recommend. We do not conduct our own product trials; our evaluations are grounded in research, published data, expert review consensus, and verified buyer feedback.

Each product is scored on our 0, 10 BP Score based on consistent criteria. Our recommendations are unbiased, and we may earn a commission when you purchase through our links.

Best King Size Mattress Cover Buying Guide

Type of Cover: Protector, Pad, or Encasement

The first decision is what kind of cover you need. A mattress protector is typically a fitted sheet-like layer that shields against spills and dust mites while adding minimal thickness.

A mattress pad offers extra cushioning and often includes a thin layer of padding or quilting, making it ideal for softening a too-firm mattress.

A mattress encasement zips completely around the mattress, providing full protection against bed bugs, allergens, and moisture, a top choice for allergy sufferers or those with young children.

Consider your primary need: if it’s purely protection, a protector or encasement works best; if comfort is the goal, a pad or topper is better. For related options, see our roundup of the best mattress cover for comfort.

Material and Breathability

Materials range from cotton, bamboo-derived rayon, polyester, to blends. Cotton tops are breathable and soft, while bamboo-derived fabrics offer natural cooling and moisture-wicking properties. Many protectors also incorporate a waterproof membrane (often polyurethane) that blocks liquids but can trap heat.

Look for covers with a breathable backing or those labeled “cooling” if you sleep hot. For hot sleepers, a mattress pad with a cotton or bamboo cover can improve airflow.

If you’re exploring overall sleep comfort, check out our guide to the best mattress for every sleeper.

Waterproofing and Protection

Not all waterproof covers are created equal. Some use a thin PU coating that is quiet and flexible, while others use a thicker vinyl layer that may crinkle.

Look for a “100% waterproof” guarantee and check that the waterproof layer is bonded to the fabric rather than just a spray-on treatment. For maximum protection against bed bugs and dust mites, a zippered encasement is essential.

Many verified buyers report that a good waterproof cover extends mattress life significantly. For more on keeping your mattress clean, see our dedicated article on the best waterproof mattress cover.

Fit and Pocket Depth

A king size mattress can vary in thickness from 8 to 18 inches or more. Ensure the cover you choose has a deep enough pocket to fit your mattress height.

Most covers list a depth range (e.g., 8″, 21″) and come with elasticized edges or a fitted sheet style. A snug fit prevents the cover from shifting during sleep.

If you have an adjustable base or a very thick pillow-top mattress, look for covers with extra-deep pockets and strong elastic. For more on mattress foundations, read about adjustable bed bases.

Ease of Cleaning and Care

Most mattress protectors and pads are machine washable. Check the care instructions, some waterproof covers require gentle cycles and low heat drying to maintain the waterproof layer. Covers with a removable top layer are easier to wash.

Zippered encasements may need to be washed less frequently but are bulkier to handle. For busy households, a cover that can be tossed in the wash without special treatment is a plus.

If you’re also looking for easy-care bedding, explore our bed sheets guide.

Additional Features: Cooling, Quilting, and Noise

Some covers offer extra features like cooling gel infusions, quilted tops for added plushness, or noise-free membranes.

If you sleep hot, look for covers labeled “cooling” or “breathable.” Quilted tops add a layer of comfort similar to a mattress pad but without adding significant thickness.

Noise from a waterproof layer can be a concern; many newer covers use a noiseless or whisper-quiet technology. Reading verified buyer feedback is a good way to gauge real-world noise levels.

For more on sleeping cool, see our best plush mattress recommendations.

Why You Should Trust Us

At BestProducts, we are committed to providing independent, research-backed recommendations. We do not conduct our own product trials; our evaluations are grounded in research, published data, expert review consensus, and verified buyer feedback.

Each product is scored on our 0, 10 BP Score using a consistent set of criteria that includes material quality, durability, user satisfaction, and value.

Our team analyzes hundreds of reviews, compares specifications, and synthesizes expert opinions to bring you a curated list of the best king size mattress covers available.

We are transparent about our process and may earn a commission if you purchase through our links, but this does not influence our picks. Our goal is to help you make an informed decision with confidence.

Final Thoughts

After evaluating dozens of king size mattress covers based on expert consensus, verified buyer feedback, and our BP Score criteria, we are confident these picks represent the best options for different needs and budgets.

• Best Overall: SafeRest Waterproof King Size Mattress Protector, This protector consistently earns top marks for its balance of waterproofing, breathability, and quiet comfort. With a 9.9 BP Score, it’s the most recommended by experts and buyers alike for everyday use.
• Best Budget Pick: MUXHOMO Premium 100% Waterproof King Mattress Protector, An affordable option that doesn’t skimp on features, offering a breathable 3D air fabric and deep pockets. It’s a great value for those on a tight budget.
• Best for Comfort: CozyLux King Mattress Pad, Cotton Top, 450 GSM Down Alternative Fill, If you want to add plushness without buying a new mattress, this pad provides a thick, comfortable layer with a soft cotton top. It’s ideal for softening a firm mattress.
• Best for Allergy Protection: Utopia Bedding King Size Mattress Protector Zippered, 100% Waterproof, A zippered encasement that fully encloses the mattress, blocking bed bugs, dust mites, and allergens. It’s a top choice for allergy sufferers.

Frequently Asked Questions

What’s the difference between a mattress protector and a mattress pad?

A mattress protector is primarily designed to shield the mattress from spills, stains, dust mites, and allergens. It is usually thin and fitted like a sheet.

A mattress pad, on the other hand, adds a layer of cushioning or padding for extra comfort, often with a quilted or plush top. Some pads also include a waterproof layer, combining protection with comfort.

For more on mattress enhancements, see our mattress toppers guide.

Can I use a mattress cover with an adjustable bed?

Yes, but you need to ensure the cover is compatible. Look for covers with flexible materials and deep pockets that can accommodate the bending and movement of an adjustable base.

Most stretchable fitted protectors work well, but rigid or non-stretchy encasements may bunch or tear. Check the product details for adjustable bed compatibility. For more on adjustable bases, read about adjustable bed bases.

How often should I wash my mattress cover?

It’s recommended to wash your mattress protector or pad every 1-2 months, or more frequently if you have allergies, pets, or spills.

Follow the care label instructions; most are machine washable in cold water and can be tumble dried on low. Regular washing helps maintain hygiene and prolongs the life of the cover.

For more bedding care tips, explore our comforters and duvets section.

Do waterproof mattress covers make you sweat?

Some older waterproof covers can trap heat and moisture, leading to discomfort. However, many modern covers use breathable membranes or bamboo-derived fabrics that allow air circulation while blocking liquids. Look for covers labeled “breathable” or “cooling” to minimize sweating.

Reading verified buyer reviews can help identify models that sleep cool. For a cooler sleep surface, consider a king size air mattress with built-in cooling features.

Can a mattress encasement prevent bed bugs?

Yes, a zippered mattress encasement that fully encloses the mattress can prevent bed bugs from entering or escaping. Look for encasements specifically labeled “bed bug proof” with a tight zipper and reinforced seams.

It’s an effective part of an integrated pest management approach. For additional protection, also consider encasing your box spring. For more on mattress protection, see our mattress protectors category.

What size mattress cover do I need for a king bed?

A standard king mattress measures 76 inches wide by 80 inches long. Most king size covers are designed to fit this dimension. However, mattress thickness varies, so check the pocket depth.

Some covers fit mattresses up to 18 inches thick, while others are for standard 8, 12 inch depths. Always measure your mattress and compare with the product’s depth range. For more bedding dimensions, visit our sleep and bedding hub.

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