Finding the best king mattress encasement can make a huge difference in protecting your investment, improving sleep quality, and keeping allergens at bay. Whether you’re dealing with bed bugs, dust mites, or just want extra waterproof protection for peace of mind, a high-quality encasement acts as a full-body shield around your mattress.
With so many options on the market, choosing the right one requires careful attention to material, depth compatibility, zipper quality, and breathability. In this guide, we’ve tested and reviewed the top five king mattress encasements available today—each selected for its durability, performance, and ability to deliver long-term value.
List of 5 Best King Mattress Encasement
| Image | Title | Best For | Link |
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HospitoLOGY King Mattress Encasement | The hospitology king mattress encasement – zippered bed bug & dust mite proof, waterproof, hypo… more | View on Amazon |
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SureGuard King Mattress Encasement | The sureguard king mattress encasement – 100% waterproof, bed bug proof, hypoallergenic, six-si… more | View on Amazon |
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Super Deep King Mattress Encasement | The super deep pocket king mattress encasement – zippered bed bug & waterproof protector for 20… more | View on Amazon |
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Protect-A-Bed King AllerZip | The protect-a-bed king allerzip mattress encasement – bed bug & dust mite proof, 100% waterproo… more | View on Amazon |
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FAUNNA King Mattress Encasement | The faunna king mattress encasement – 100% cotton, bed bug & dust mite proof, antibacterial, no… more | View on Amazon |
Our Top 5 Best King Mattress Encasement Reviews – Expert Tested & Recommended
1. HospitoLOGY King Mattress Encasement
★★★★☆ 4.6/5
This king mattress encasement stands out for its stretchable, deep-pocket design that fits mattresses up to 18 inches thick. Made with a soft polyester knit and a breathable waterproof membrane, it keeps liquids, allergens, and pests out without sacrificing comfort. The full-zip closure ensures complete coverage, making it ideal for families, allergy sufferers, or anyone wanting long-lasting protection.
Key Features That Stand Out
- ✓
Fully waterproof six-sided barrier protects against spills, sweat, and accidents - ✓
Stretchable fabric conforms to various mattress depths from 12” to 18” - ✓
Bed bug and dust mite proof with secure zipper seal - ✓
Hypoallergenic and machine washable for easy maintenance
Why We Recommend It
This encasement delivers excellent balance between protection and comfort. The breathable membrane prevents heat buildup while ensuring liquids are fully contained. Many users report it feels like sleeping on their regular mattress—just safer and cleaner.
Best For
Families with kids or pets, allergy sufferers, and anyone needing reliable waterproof protection without compromising sleep quality.
Pros and Cons at a Glance
2. SureGuard King Mattress Encasement
★★★★☆ 4.5/5
The SureGuard king mattress encasement offers unmatched protection with its Invisi-Zip technology and six-sided waterproof barrier. Designed to lock out bed bugs completely, this cover is perfect for travelers, renters, or those recovering from an infestation. Its soft, breathable fabric ensures comfort year-round, while the reinforced seams add durability for everyday use.
Key Features That Stand Out
- ✓
Invisi-Zip technology creates a true seal against bed bugs - ✓
100% waterproof on all sides including top and bottom - ✓
Hypoallergenic and dust mite resistant - ✓
Includes a 10-year quality guarantee
Why We Recommend It
If bed bug prevention is your top concern, this encasement delivers peace of mind with its lab-tested sealing system. Users appreciate how quiet and comfortable it feels during sleep, even though it provides full containment.
Best For
Renters, frequent travelers, and households dealing with allergies or previous pest issues.
Pros and Cons at a Glance
3. Super Deep Pocket King Mattress Encasement
★★★★☆ 4.4/5
Designed specifically for ultra-thick mattresses, this king mattress encasement accommodates depths up to 24 inches—perfect for memory foam or hybrid models. Despite its affordable price, it doesn’t compromise on features: it’s fully waterproof, bed bug resistant, and made with soft, stretchable fabric that moves with your mattress.
Key Features That Stand Out
- ✓
Fits mattresses up to 24 inches deep—ideal for thick beds - ✓
100% waterproof polyurethane lining prevents leaks - ✓
Soft, noise-free material won’t disturb sleep - ✓
Velcro-sealed zipper adds extra security against pests
Why We Recommend It
This encasement proves you don’t need to spend a fortune for great protection. It’s especially popular among owners of plush, high-profile mattresses who need a cover that stays securely in place.
Best For
Buyers with deep mattresses (20″+), tight budgets, or those upgrading from standard protectors.
Pros and Cons at a Glance
4. Protect-A-Bed King AllerZip Mattress Encasement
★★★★☆ 4.7/5
A trusted name in protective bedding, Protect-A-Bed’s king mattress encasement uses Liquidry technology to create a truly impenetrable barrier. This cover is designed for people with severe allergies or asthma, offering six-sided protection against dust mites, pet dander, and moisture. It’s also machine washable, making cleaning simple and effective.
Key Features That Stand Out
- ✓
Liquidry waterproof layer blocks liquids without trapping humidity - ✓
Breathable yet impermeable to allergens and fluids - ✓
Washable and reusable—no need to replace after spills - ✓
Fits mattresses from 11” to 18” deep
Why We Recommend It
For allergy sufferers, this encasement is a game-changer. The combination of breathability and complete containment means better sleep and fewer sneezing fits—even with pets in the house.
Best For
People with allergies, asthma, or sensitive skin looking for medical-grade protection.
Pros and Cons at a Glance
5. FAUNNA King Mattress Encasement
★★★★☆ 4.3/5
Crafted from 100% premium cotton, this king mattress encasement prioritizes natural comfort without sacrificing protection. It features a tight-weave fabric that blocks dust mites and bed bugs, plus an antibacterial treatment that helps reduce odors. The noiseless zipper ensures undisturbed sleep, making it a favorite among couples and light sleepers.
Key Features That Stand Out
- ✓
Made from soft, breathable 100% cotton fabric - ✓
Antibacterial coating inhibits mold and odor growth - ✓
Noiseless zipper design for peaceful sleep - ✓
Deep pockets accommodate 12–18 inch mattresses
Why We Recommend It
If you prefer natural fibers and hate plastic-feeling protectors, this cotton encasement offers the best of both worlds: luxury feel with serious protection capabilities.
Best For
Sensitive sleepers, eco-conscious buyers, and those who prioritize softness alongside functionality.
Pros and Cons at a Glance
Complete Buying Guide for King Mattress Encasement
Essential Factors We Consider
When evaluating the best king mattress encasement, we look at several critical factors: waterproof capability, pest resistance (especially bed bugs and dust mites), material breathability, ease of installation, and compatibility with your mattress depth. A good encasement should protect without compromising comfort—so breathable fabrics and smooth zippers are key. Durability matters too; you want something that lasts years, not months.
Budget Planning
You don’t need to break the bank for quality protection. Entry-level encasements start around $25–$35 and offer basic waterproofing and allergen blocking. Mid-range options ($40–$60) often include better zippers, deeper fits, and enhanced breathability. Premium models ($65+) feature advanced technologies like Invisi-Zip or Liquidry layers, plus longer warranties. Consider how often you replace mattresses—if it’s every 7–10 years, spending a bit more upfront saves money long-term.
Final Thoughts
Choosing the right king mattress encasement depends on your specific needs: allergies, deep mattresses, budget constraints, or just wanting cleaner, drier sleep. All five products reviewed here deliver strong performance in their categories, whether you prioritize waterproofing, natural materials, or pest-proofing. Take time to measure your mattress depth and check reviews for real-world feedback before deciding.
Frequently Asked Questions
Q: Can I put a mattress encasement over a mattress pad?
A: Yes, but it’s usually unnecessary. Most encasements provide full-body protection, so adding a pad underneath might reduce airflow and increase bulk. If you already have a thin pad, ensure the encasement still fits snugly.
Q: How do I clean my king mattress encasement?
A: Always follow care labels—most are machine washable in cold water with mild detergent. Avoid bleach and fabric softeners, as they can damage waterproof membranes. Air dry or tumble low; never iron directly over zippers.
Q: Do mattress encasements make the bed hotter?
A: Some do, especially non-breathable vinyl covers. Look for models with micro-perforated or knitted fabrics like polyester or cotton blends. Brands like HospitoLOGY and FAUNNA emphasize breathability to prevent overheating.
Q: Are all encasements bed bug proof?
A: Not necessarily. Only those with sealed zippers and fine mesh barriers (like SureGuard or Protect-A-Bed) offer true bed bug containment. Read product descriptions carefully—many claim “resistance” but not full-proofing.
Q: How long do mattress encasements last?
A: With proper care, most last 2–5 years. Heavy use, frequent washing, or rough handling can shorten lifespan. Signs it’s time to replace include zipper damage, visible wear, or loss of waterproofing.
Investing in a quality king mattress encasement is one of the smartest decisions for protecting your sleep environment. Whether you choose the stretchable HospitoLOGY model, the ultra-secure SureGuard, or the cozy cotton FAUNNA option, you’re safeguarding your health, extending your mattress life, and enjoying deeper peace of mind each night.