7 Best Waterproof Bed Bug Mattress Covers for King Size Beds (2025 Buyer’s Guide)

When it comes to protecting your king-size bed, a waterproof bed bug mattress cover is your first line of defense. These encasements don’t just guard against infestations—they also shield against spills, allergens, sweat, and dust mites. Whether you’re safeguarding a new mattress or dealing with past pest problems, the right cover can make a huge difference.

Choosing the perfect mattress cover can be overwhelming, given the many options on the market. That’s why we’ve done the research for you. Here are the 7 best waterproof bed bug mattress covers for king size beds. Each one includes pros and cons, 6 helpful FAQs, and key features to help you make an informed decision. With these picks, you can enjoy a cleaner, healthier, and more comfortable night’s sleep—without worrying about bed bugs or moisture damage.

1. SafeRest Premium Zippered King Mattress Encasement

Best Overall Protection – Amazon Best Seller

SafeRest is a top-rated, best-selling cover that offers full six-sided protection. It blocks bed bugs, allergens, fluids, and more—without trapping heat or making noise. Its cotton terry surface adds comfort while maintaining breathability.

✅ Pros:

• Certified waterproof and bed bug proof

• Soft, noiseless terry surface

• Deep pocket design fits up to 18″

• Machine washable

❌ Cons:

• Can feel slightly warm in humid climates

• Zipper must be handled gently

Don’t compromise on sleep or hygiene. Buy SafeRest’s best-selling King encasement on Amazon today!

2. Utopia Bedding Zippered Mattress Encasement – King

Best Budget Option

This wallet-friendly option provides excellent protection at a lower price. It features a stretchable knitted fabric and a waterproof TPU backing. While it’s affordable, it doesn’t skimp on quality or performance.

✅ Pros:

• Budget-friendly

• Bed bug, spill, and dust protection

• OEKO-TEX certified fabric

• Fits 15″ deep mattresses

❌ Cons:

• Fabric isn’t ultra-soft

• May require two people to zip on snugly

Stay protected without overspending. Click here to grab the Utopia King Encasement now!

3. SureGuard King Mattress Encasement

Best for Premium Comfort

SureGuard is ideal for those who value softness and luxury. Its 100% cotton surface makes it breathable, while the micro-zipper technology keeps out bed bugs with lab-tested precision. It’s also GREENGUARD Gold certified.

✅ Pros:

• Super soft cotton top

• Advanced zipper lock

• Hypoallergenic

• 10-year warranty

❌ Cons:

• Slightly pricier than average

• Tight initial fit, but stretches over time

Experience the difference premium fabric makes. Get SureGuard’s King mattress protector today!

4. LINENSPA Zippered Encasement – King

Best for Families with Kids or Pets

LINENSPA’s encasement offers six-sided protection and a lightweight feel. It’s waterproof, vinyl-free, and super quiet—perfect for kids who toss and turn or pets that may have accidents.

✅ Pros:

• 100% waterproof barrier

• Quiet and soft polyester fabric

• Velcro zipper flap

• Deep pockets up to 18″

❌ Cons:

• Zipper may fray with rough use

• May require more frequent washes with pets

Kid-proof and pet-tested. Order the LINENSPA King Encasement here!

5. Hospitology Sleep Defense System – King

Best for Allergy Sufferers

This encasement is specifically designed for allergy control. It’s lightweight, breathable, and provides a barrier against bed bugs, pollen, pet dander, and more. Its zip enclosure uses an internal flap for extra safety.

✅ Pros:

• Hypoallergenic and lab-tested

• No plastic noise

• Deep pockets (up to 18″)

• Great for skin sensitivities

❌ Cons:

• May have a light factory smell initially

• Can feel tight on taller mattresses

 “Specifically designed for allergy control…”Sleep safe and sneeze-free. Shop Hospitology’s Sleep Defense King Cover now!

6. Bedecor Zippered Mattress Protector – King

Best Zipper Protection

Bedecor’s cover features a 360° zipper with a tight Velcro flap that seals the deal—literally. It’s great for those who want heavy-duty zip protection without a loud plastic feel. The smooth surface is gentle on sheets too.

✅ Pros:

• Extra-strong zipper system

• Waterproof and breathable

• Lightweight and thin

• Easy to remove and wash

❌ Cons:

• Slightly thinner than other brands

• May need ironing after washing

 “Bedecor’s cover features a 360° zipper…”Zip your way to bed bug-free sleep. Click here to get Bedecor’s King-size protector now!

7. Four Seasons Essentials King Encasement

Best for Deep Pocket Mattresses

Got a tall or pillow-top mattress? This one fits up to 16 inches and seals it fully. The smooth polyester blend keeps it breathable, while the waterproof layer traps moisture and bed bugs alike.

✅ Pros:

• Perfect for thicker mattresses

• Waterproof and allergen-proof

• Soft and smooth fabric

• Machine washable

❌ Cons:

• A bit bulky for thin beds

• Takes time to dry fully

 “This one fits up to 16 inches…”Thicker mattress? No problem. Get Four Seasons Essentials Encasement now on Amazon!

🧠 FAQs About Waterproof Bed Bug Mattress Covers for King Beds

1. How do I know if it really blocks bed bugs?

Look for six-sided encasements with zippers and internal flaps. Products like SafeRest and SureGuard are lab-tested to block both adult bugs and nymphs.

2. Is it loud or crinkly like plastic?

No. The covers in this list are soft and silent, made from cotton terry or polyester blends. You won’t hear a thing when moving at night.

3. Can I still use regular sheets on top?

Yes. These encasements fit underneath your sheets and mattress pads like a second skin. They don’t affect bedding layers.

4. Will these protect against spills and sweat?

Absolutely. Every cover on this list has a waterproof membrane to stop spills, sweat, and urine from damaging your mattress.

5. Do I need to wash it often?

Washing every 1–2 months is ideal. If there’s a spill or visible stain, wash immediately. Use cool water and avoid bleach.

6. Do they fit all king-size mattresses?

Most support mattresses up to 16–18 inches deep. Always check your mattress height before ordering to ensure the perfect fit.

Conclusion: Which One Is Right for You?

Every king-size mattress deserves protection—especially from bed bugs and moisture. If you want the best overall, go with SafeRest. Looking for a budget solution? Utopia Bedding delivers. Need extra comfort and softness? Then SureGuard is your best bet.

Each of these mattress covers was selected for its unique strengths—comfort, value, allergy defense, or zip security. And each one provides total peace of mind while you sleep.

Don’t wait for bed bugs or a spill to destroy your investment.
Choose your top pick from this list of 7 best King-size waterproof encasements, and click the Amazon links above to order today.
The faster you act, the better you’ll sleep.