If you need reliable protection for a split king setup, the right encasement can help guard against bed bugs, dust mites, and spills without making bed maintenance harder.
Below, we focus on practical options for fit, waterproofing, zipper security, and everyday comfort so you can choose with confidence.
Best 10 Bed Bug Mattress Encasement for Split King Picks for 2026
Top Pick for Split King Waterproof Coverage
Split King Waterproof Encasement for Adjustable Beds
- 2-pack covers two 39" x 80" mattresses
- Six-sided zippered design with Velcro seal
- Waterproof and machine washable
Best For: Split king owners needing a fully enclosed waterproof protector
Best for Split Box Spring Protection
Split King Box Spring Defense System
- Two encasements for split king box springs
- Fits 9" to 11" depths
- Machine washable and dryable
Best For: Split king box springs that need zippered protective covers
Quiet Waterproof Split King Option
Waterproof Split King Mattress Cover for Adjustable Beds
- Two-piece set for 39" x 80" split king mattresses
- Six-sided waterproof enclosure
- Soft, quiet polyester surface
Best For: Split king beds needing a quiet waterproof mattress protector set
Standard King Pick, Not Split King
Standard King Waterproof Bed Bug Encasement
- Six-sided waterproof king encasement
- Breathable polyester knit fabric
- Machine washable with 5-year warranty
Best For: Standard king mattresses, not split king beds
Split King Waterproof Encasement
- Two Twin XL pieces cover one split king setup
- Six-sided zipper with Velcro seal
- Waterproof, hypoallergenic, and machine washable
Best For: Split king owners who want full encasement coverage in two pieces
King Bed Bug Guard
Utopia Bedding Zippered Encasement
- 360° zippered coverage on all sides
- 100% waterproof and bed bug proof
- Soft polyester build with machine care
Best For: Standard king mattresses needing simple waterproof bug protection
Premium Deep-Pocket Barrier
- Six-sided waterproof protection
- Invisi-Zip and SureSeal help block bed bugs
- Soft cotton terry top with GREENGUARD Gold certification
Best For: Deep king mattresses needing premium waterproof and bug-proof coverage
Budget-Friendly Waterproof Encasement
King Size Waterproof Zippered Cover
- Six-sided zippered cover with Velcro zipper seal
- 100% waterproof polyurethane inner lining
- Soft, breathable, noiseless fabric
Best For: A simple, quiet waterproof cover for a standard-depth king mattress
Deep-Pocket Premium Pick
SureGuard 17-20 Inch King Encasement
- Fits extra-deep king mattresses from 17 to 20 inches
- Bed bug proof zipper system with Invisi-Zip and SureSeal
- 100% waterproof with soft cotton terry top
Best For: Extra-deep king mattresses that need premium waterproof and bed bug protection
Breathable Anti-Allergen Choice
- Bug Lock system provides six-sided bed bug and dust mite protection
- Waterproof Liquidry layer is breathable and whisper quiet
- FUZE antimicrobial treatment helps reduce odors
Best For: Allergy-conscious buyers who want quiet, waterproof pest protection
Top Pick for Split King Waterproof Coverage – Split King Waterproof Encasement for Adjustable Beds
If you need a bed bug mattress encasement for split king setups, this two-pack is built for full six-sided coverage on each Twin XL mattress. It combines a zippered seal, waterproof inner lining, and a stretch fabric shell, making it a practical pick for adjustable beds where a snug fit matters.
Best For: Split king owners who want a waterproof, fully zippered encasement for two Twin XL mattresses.
Pros:
- Includes 2 encasements sized 39" x 80" each for split king mattresses
- Six-sided zippered design with Velcro zipper seal for fuller enclosure
- 100% waterproof polyurethane inner lining helps block liquids and moisture
- Made to fit 16" to 20" deep mattresses and is machine washable
Cons:
- Only fits split king / Twin XL-style mattresses, not a single king mattress
- Depth range is limited to 16" to 20"
This is a strong fit if your priority is complete coverage and easy maintenance on a split king bed. The breathable, noiseless construction also makes it more comfortable for everyday use than a stiff protective cover.
Best for Split Box Spring Protection – Split King Box Spring Defense System
This bed bug mattress encasement for split king setups is designed for the box springs, not the mattress itself. If you need protection for split king foundations, this two-pack offers zippered coverage in a stretch polyester knit that’s meant to make installation easier.
Best For: Split king sleepers who want zippered protection for split box springs only.
Pros:
- Includes 2 encasements sized for split king box springs
- Fits 9" to 11" box spring depths
- Stretchable 100% polyester knit fabric for easier installation
- Machine washable and dryable with a 5-year limited warranty
Cons:
- For box springs only, not mattresses
- Water resistance is listed as water resistant, not fully waterproof
Choose this option if you specifically want to encase the foundations under a split king bed. Its main advantage is straightforward coverage with a zippered build and easy care, but it is not the right pick if you need mattress protection.
Quiet Waterproof Split King Option – Waterproof Split King Mattress Cover for Adjustable Beds
If you want a bed bug mattress encasement for split king mattresses with full coverage, this set gives you two zippered protectors in one package. Each protector is built for 6-sided enclosure, waterproof performance, and a soft knit surface that aims to stay quiet under bedding.
Best For: Split king adjustable beds needing two waterproof zippered mattress protectors.
Pros:
- Two protectors included, each measuring 39" x 80"
- 100% waterproof six-sided encasement design
- Soft, noiseless knitted polyester surface
- Breathable membrane layer helps repel liquids while letting air pass through
Cons:
- Fits 9" to 12" deep mattresses, so taller beds may not fit
- Product is a protector set, not a single-piece king encasement
This is a practical choice if you want a balanced mix of waterproofing, breathability, and comfort. The two-piece split king format makes it a better match for adjustable beds than a standard king cover.
Standard King Pick, Not Split King – Standard King Waterproof Bed Bug Encasement
This bed bug mattress encasement for split king search results is actually a standard king cover, so it is not the right size for two Twin XL mattresses. What it does offer is a lab-tested, zippered waterproof design with breathable fabric for buyers who need a regular king encasement instead of a split setup.
Best For: Standard king mattresses that need a waterproof zippered encasement.
Pros:
- 100% waterproof barrier on all six sides
- Stretchable polyester knit fabric with a breathable membrane
- Machine washable and tumble dry low
- Backed by a 5-year limited manufacturer’s warranty
Cons:
- Fits a standard king mattress, not a split king setup
- Sold as a single encasement rather than a two-pack
If your bed is truly split king, this model should be ruled out on size alone. For a normal king mattress, though, it provides the kind of full waterproof coverage and easy care many shoppers want in a protective encasement.
Split King Waterproof Encasement – Split King 2-Piece Protector
If you need a bed bug mattress encasement for split king setups, this 2-piece cover is built to protect two Twin XL mattresses that together form one split king. It uses six-sided zippered encasements, a Velcro zipper seal, and a waterproof polyurethane lining to help block bugs, allergens, and spills without adding much noise.
Best For: Split king owners who want full encasement coverage in two easy-to-manage pieces.
Pros:
- Includes 2 pieces sized 39" x 80" each to cover a split king mattress set
- Six-sided zippered design with Velcro zipper seal for complete enclosure
- 100% waterproof polyurethane inner lining helps block liquids and moisture
- Soft, stretchable, and designed to be noiseless under sheets
Cons:
- Requires managing two encasements instead of one
- Only fits mattresses or box springs 12" to 16" deep
This is a practical option if your priority is sealed protection for a split king bed rather than a single-piece design. The washable build and hypoallergenic materials add everyday convenience, especially for homes dealing with spills, pets, or dust concerns.
King Bed Bug Guard – Utopia Bedding Zippered Encasement
For shoppers comparing a bed bug mattress encasement for split king situations, this Utopia Bedding model is a straightforward waterproof zippered cover, though it is sized for a standard king mattress rather than two split king halves. It offers 360-degree coverage, a secure wrap-around zipper, and a quiet polyester build that stays flat on the bed.
Best For: Standard king mattresses where waterproof, bug-proof protection is the main goal.
Pros:
- 360° coverage fully encases all sides of the mattress
- 100% waterproof layer helps block spills, sweat, and accidents
- Soft knitted polyester is designed to be quiet and non-crinkling
- Machine washable and tumble dry safe for easy care
Cons:
- Designed for a standard king size, not a split king two-piece setup
- Fits mattresses up to 15 inches deep only
This encasement makes sense if you need a full zippered barrier on a conventional king bed. If your bed is truly split king, the sizing will be the key limitation to check before buying.
Premium Deep-Pocket Barrier – SureGuard Zippered Encasement
If you want a premium bed bug mattress encasement for split king protection, this SureGuard cover is a strong choice for a standard king mattress with a deeper fit range. It uses a six-sided zippered design, a fine Invisi-Zip and SureSeal system, and a soft cotton terry top to keep the mattress protected without a plastic feel.
Best For: Deep king mattresses where waterproofing and bed bug protection are both top priorities.
Pros:
- 100% waterproof six-sided protection against liquids and stains
- Bed bug proof zipper design with Invisi-Zip and SureSeal technology
- Soft, noiseless cotton terry top retains mattress feel
- GREENGUARD Gold certified and machine washable
Cons:
- Made for a standard king mattress, not two split king pieces
- Fits 13" to 16" deep mattresses only
This is the most premium-feeling option in the group if your bed matches the size and depth range. The combination of waterproofing, bug sealing, and non-toxic material claims makes it a well-rounded choice for long-term mattress protection.
Budget-Friendly Waterproof Encasement – King Size Waterproof Zippered Cover
If you need a bed bug mattress encasement for split king use on an individual king-size mattress, this waterproof zippered cover is a straightforward, practical option. It fully encloses the mattress on all sides, adds a Velcro zipper seal, and uses stretch fabric that stays soft and quiet under sheets.
Best For: Shoppers who want a simple six-sided king encasement with waterproof protection and a quieter feel.
Pros:
- Six-sided zippered design with a Velcro zipper seal for full coverage
- 100% waterproof polyurethane inner lining helps block spills and moisture
- Soft, breathable, noiseless fabric designed to avoid crinkly sounds
- Machine washable for easier upkeep
Cons:
- Fits king mattresses 12″ to 16″ deep, so deeper mattresses may not work
- King size only, so split king setups need one cover per mattress
- Focused on basic protection rather than specialty features like antimicrobial treatment
This is a solid no-frills pick if your priority is sealing out bed bugs, dust, and liquids without adding noise or bulk. The fit range and simple construction make it easy to understand, but you should verify your mattress depth before buying.
Deep-Pocket Premium Pick – SureGuard 17-20 Inch King Encasement
For a bed bug mattress encasement for split king setups where each mattress needs a deep-pocket fit, this SureGuard option stands out for its 17 to 20 inch depth range. It is built as a six-sided waterproof encasement with a tightly sealing zipper system, making it a strong choice when you want protection and a more premium sleep surface.
Best For: Owners of extra-deep king mattresses who want waterproof, bed bug proof protection with a cotton terry feel.
Pros:
- Six-sided design is bed bug proof with Invisi-Zip and SureSeal technology
- 100% waterproof construction blocks perspiration, liquids, and stains
- Soft cotton terry top helps preserve the feel of the mattress
- Machine washable and dryable, with GREENGUARD Gold certification
Cons:
- Only fits king mattresses 17 to 20 inches deep
- King size means split king buyers need a separate encasement for each side
- Premium build may be more feature-rich than some shoppers need
If your mattress is especially deep, this model is one of the better matches in the roundup. It combines a secure bed bug barrier with waterproof protection and a softer surface than many fully synthetic options.
Breathable Anti-Allergen Choice – Protect-A-Bed AllerZip King
If you want a bed bug mattress encasement for split king use that also addresses dust mites and allergens, the Protect-A-Bed AllerZip is built around six-sided full enclosure protection. Its waterproof Liquidry layer and breathable knit fabric are designed to keep the mattress quiet, while the Bug Lock system adds an extra barrier against pests.
Best For: Buyers who want waterproof, bed bug proof, and dust mite proof protection with an antimicrobial angle.
Pros:
- Six-sided fully encased design with Bug Lock bed bug protection
- Waterproof Liquidry layer is breathable and whisper quiet
- FUZE antimicrobial treatment helps fight odors
- Machine washable in hot water for easier cleaning and mite control
Cons:
- Fits mattresses 11 to 18 inches deep, so measure carefully
- King size means split king setups need one encasement per mattress
- 100% polyester knit feel may not suit buyers who prefer cotton terry
This is a well-rounded option if your main concern is more than just bed bugs. The combination of waterproofing, dust mite defense, and odor control makes it appealing for everyday mattress protection.
How We Picked the Best Bed Bug Mattress Encasement for Split King
For a Bed Bug Mattress Encasement for Split King, the biggest priorities are accurate sizing, secure zipper closure, waterproof protection, and durable materials that hold up over time. We also favored models that are easy to install and remove for laundering, since an encasement only helps if you can keep it clean and fully sealed.
Quick Comparison
Not every split king setup is the same. Some buyers need two separate Twin XL encasements, while others want a protector for a single king mattress or a matching box spring cover. Deep-pocket models are especially important if your mattress runs tall, and adjustable beds may benefit from full six-sided coverage that stays in place through movement.
Key Buying Factors for a Bed Bug Mattress Encasement for Split King
Size and Configuration
Confirm whether your bed uses two Twin XL mattresses or another split arrangement. The wrong size can leave gaps at the seams or make the zipper harder to close. If you have a split king adjustable bed, look for products specifically designed to flex with movement.
Bed Bug Seal and Zipper Design
A true bed bug-proof encasement should fully enclose the mattress with a secure zipper system. Look for tightly fitted closures and, when available, a locking or reinforced zipper guard to reduce the chance of openings over time.
Waterproofing and Breathability
Waterproof protection is useful for spills, sweat, and accidents, but comfort still matters. The best options balance liquid resistance with a sleep surface that does not feel overly plastic or noisy.
Depth and Material Quality
Deep mattresses need appropriately sized covers, especially if your mattress is 13 inches or thicker. Stretchy, hypoallergenic fabrics can improve fit and comfort, while stronger seams help the cover hold up through repeated wash cycles.
Who Should Buy Which Bed Bug Mattress Encasement for Split King?
If you want the simplest setup for a split king, choose a two-piece Twin XL encasement solution. If you are protecting a full king mattress instead of separate halves, a six-sided king encasement may be the better match. Buyers with taller mattresses should prioritize deep-pocket versions, and those mainly concerned about spills may prefer a waterproof model with easier everyday maintenance. For the best long-term Bed Bug Mattress Encasement for Split King use, match the product to your exact bed configuration first, then refine by waterproofing, zipper quality, and fit.