King Size Mattress Protectors

King size mattress protectors help you care for your mattress while creating a more comfortable foundation for restful sleep. Explore King Size Mattress Protectors at Mattress Firm to find options that fit your bed and support your sleep routine.

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Sleepy's Signature TOTAL DEFENSE Mattress Protector

5687

Starting at

$129⁹⁹

Temperature
Allergies

Save $100 when you bundle¹⁰.

Sleepy's Deluxe Comfort Cool Mattress Protector

4179

Starting at

$169⁹⁹

Temperature
Allergies

Save $150 when you bundle¹⁰.

Sleepy's Basics Waterproof Mattress Protector

2492

Starting at

$69⁹⁹

Temperature
Allergies

Save $50 when you bundle¹⁰.

Bedgear Ver-Tex Performance Mattress Protector

162

Starting at

$299⁹⁹

Temperature

Tempur-Pedic TEMPUR-Protect Breeze Mattress Protector

802

Starting at

$309⁰⁰

Allerease Ultimate Mattress Protector

337

Starting at

$49⁹⁹

Temperature
Allergies

Bedgear StretchWick Mattress Protector

155

Starting at

$129⁹⁹

Temperature
Allergies

Sleepy's Signature Total Encasement Mattress Protector

1001

Starting at

$159⁹⁹

Temperature

Bedgear Dri-Tec Mattress Protector

150

Starting at

$189⁹⁹

Temperature
Allergies

Tulo Gel Memory Foam Zoned Support Mattress Topper

122

Starting at

$107⁹⁹

$159⁹⁹

$52 OFF

Medium Comfort,

Temperature

A king size mattress protector helps keep your mattress clean, comfortable and protected from everyday spills, sweat, dust, allergens and accidental stains. Designed to fit a standard king mattress, which typically measures 76 inches by 80 inches, a quality king mattress cover creates a protective barrier without changing the feel of your bed. Look for a waterproof king mattress protector with a breathable, quiet surface that helps guard against moisture while allowing airflow for a more comfortable night’s sleep. Options with stretchable fabric, elasticized edges and deep pockets provide a secure fit on thicker mattresses, so the protector stays in place instead of bunching or shifting as you sleep. Choosing the best king size mattress protector depends on your sleep preferences, mattress depth and desired level of protection. A cooling mattress protector can help promote a fresher sleep environment, while a hypoallergenic mattress protector may help reduce exposure to common household allergens. For homes with children, pets or frequent guests, a machine-washable waterproof mattress protector makes routine care simple and helps extend the life of a king size mattress. Be sure to select the correct size, since a California King mattress protector is longer and narrower than a standard king protector and will not provide the same fit. With the right king mattress cover, you can preserve your mattress, simplify cleaning and enjoy more comfortable zzz's night after night.

What materials are commonly used in king size mattress protectors? + -

Common materials include cotton, polyester, rayon made from bamboo and waterproof polyurethane layers. Each material offers a different feel, breathability and care routine.

How is a mattress protector different from a mattress pad? + -

A mattress protector is designed as a thin protective layer, while a mattress pad typically adds extra cushioning and surface softness. Some products combine both functions.

Are king size mattress protectors machine washable? + -

Many mattress protectors are machine washable. Always check the care label for recommended water temperature, drying instructions and whether bleach or fabric softener should be avoided.

What features can help a mattress protector feel cooler? + -

Cooling-focused designs may use breathable fabrics, moisture-managing fibers or smooth, lightweight layers. Look for product details that describe the materials and construction.

Can a mattress protector be used with a mattress topper? + -

A mattress protector can generally be placed over a mattress topper, but the combined height may affect how securely the protector fits. Check the product specifications before purchasing.