A California king mattress is a sizeable investment, and a zippered encasement can help shield it from spills, dust, and bed bugs. The key is to choose one that fits your mattress depth and has a zipper design that fully closes. These five options vary in fabric, waterproofing, and fit range. Keep in mind that an encasement protects the mattress itself; it does not replace a full bed-bug treatment plan.
Quick Comparison
| Product | Fit range | Notable features |
|---|---|---|
| Four Seasons Essentials California King Encasement | 12–16 inches deep | Waterproof, six-sided cover, zipper seal |
| SureGuard Cal King Mattress Encasement | 13–16 inches deep | Cotton terry top, waterproof, bed-bug-proof claim |
| Utopia Bedding Waterproof Zippered Encasement | 12 inches deep | Waterproof, bed-bug and dust-mite-proof claims |
| HOSPITOLOGY PRODUCTS Sleep Defense System | 12–18 inches deep | Waterproof on all six sides, breathable knit fabric |
| Four Seasons Essentials Deep-Pocket Encasement | Listing title says up to 20 inches; confirm fit | Waterproof, six-sided cover, zipper seal |
Our Picks: Best California King Mattress Protector Bed Bugs reviews
Four Seasons Essentials: A Waterproof Encasement for 12–16-Inch Mattresses
This six-sided encasement wraps around the entire mattress rather than covering only the top. Its polyester surface has a polyurethane inner lining intended to block liquids and moisture. A zipper runs around three sides, and the product description notes a Velcro zipper seal.
The fabric is described as stretchable, breathable, soft, and quiet. That may suit you if you want a full barrier without a crinkly feel under your sheets. The stated fit is for California king mattresses that are 12 to 16 inches deep, so measure the mattress—including any pillow top—before ordering.
Its waterproof construction and full enclosure make it a practical all-around option for households concerned about spills as well as mattress protection. The title mentions bed bugs, but the supplied details do not describe a specific bed-bug testing standard. If that is your main concern, compare its zipper closure with products that explicitly state a bed-bug-proof design.
Pros:
- Encloses all six sides of the mattress.
- Polyurethane lining is described as waterproof.
- Velcro zipper seal adds a closure detail.
- Machine washable, according to the product details.
Cons:
- Fit is limited to mattresses 12–16 inches deep.
- Supplied details do not specify a bed-bug testing standard.
Verdict: Choose this model if your mattress is within its depth range and you want a washable, waterproof encasement for general protection.
SureGuard: A Cotton-Terry Option with a Sealed-Zipper Design
SureGuard is a six-sided California king encasement sized for mattresses 13 to 16 inches deep. Its cotton terry top is intended to wick moisture, while the product description says the cover blocks liquids, stains, dust, dirt, and dander.
For bed-bug protection, the listed features include a fine zipper with Invisi-Zip and SureSeal technology. The brand describes the encasement as bed-bug proof and recommends pairing it with a SureGuard box-spring encasement. The mattress cover alone does not protect the rest of the bed or room, so it should be one part of a broader response to an infestation.
The product details also state that it is machine washable and dryable, has a 10-year quality guarantee, and is independently lab tested and GREENGUARD Gold certified. Its cotton terry surface may appeal if you prefer that fabric feel, though its narrower depth range makes careful measuring especially important.
Pros:
- Bed-bug-focused zipper features are described in the product information.
- Waterproof, six-sided coverage.
- Cotton terry top is designed to wick moisture.
- Machine washable and dryable, with a stated 10-year quality guarantee.
Cons:
- Fits only mattresses 13–16 inches deep.
- A separate box-spring encasement is needed to cover a box spring.
Verdict: This is a strong choice if you want explicit bed-bug-focused zipper features and your mattress measures 13–16 inches deep.
Utopia Bedding: A Close-Fitting Choice for a 12-Inch Mattress
This California king encasement is designed for a mattress measuring 72 by 84 inches with a 12-inch-deep pocket. Its zippered closure provides full enclosure, and the product description states that it is intended to protect against bed bugs and dust mites as well as spills and stains.
The smooth knitted fabric is described as breathable and quiet, with a comfortable feel that is not intended to trap heat. You can machine wash it for routine care. These features make it a straightforward pick if your mattress is close to the stated 12-inch depth and you want both moisture and pest-barrier claims.
Unlike options with a wider depth range, this model’s stated 12-inch pocket leaves little room for a taller mattress or thick topper. Check the actual mattress depth before buying, and do not assume that a fitted sheet or topper is included.
Pros:
- Designed specifically for a California king mattress measuring 72 by 84 inches.
- Waterproof and described as bed-bug and dust-mite proof.
- Breathable, smooth knitted fabric is described as quiet.
- Machine washable.
Cons:
- Stated pocket depth is 12 inches, limiting fit flexibility.
- Product details do not provide a separate warranty or testing standard.
Verdict: Consider this encasement if your California king mattress is 12 inches deep and you want a simple, washable waterproof cover with stated pest-barrier features.
HOSPITOLOGY PRODUCTS: A Stretch-Fit Encasement for Mattresses up to 18 Inches
The Sleep Defense System is a zippered encasement for standard California king mattresses 12 to 18 inches deep. Its polyester knit fabric stretches to fit, and the product details describe a waterproof barrier on all six sides. The title identifies it as a bed-bug and dust-mite-proof mattress encasement.
The breathable waterproof membrane and extra-soft knit fabric are designed to protect the mattress without trapping heat. This wider fit range than the 12-inch Utopia option gives you more flexibility if your mattress is taller, while still requiring you to measure before ordering.
The cover is machine washable and should be tumble dried on low, according to the product details. It also comes with a stated five-year limited manufacturer’s warranty. The supplied information does not describe a specific zipper-seal mechanism, so check the product listing for closure details if that feature is a priority for you.
Pros:
- Fits California king mattresses 12–18 inches deep.
- Waterproof barrier covers all six sides.
- Stretchy knit fabric is described as breathable and comfortable.
- Machine washable, with a stated five-year limited warranty.
Cons:
- Does not fit mattresses deeper than 18 inches, based on the supplied details.
- The supplied description does not explain the zipper-seal design.
Verdict: Pick this model if you need a wider depth range and want a waterproof, washable encasement with bed-bug and dust-mite protection claims.
Four Seasons Essentials Deep-Pocket Encasement: Verify the California King Fit
This Four Seasons Essentials cover is presented as a deep-pocket, six-sided zippered encasement. Its product title says it fits mattresses up to 20 inches deep. The description lists a polyester surface, polyurethane waterproof lining, Velcro zipper seal, and machine-washable construction.
There is an important detail to check before ordering: the supplied description says the cover is built to fit a Queen mattress 16 to 20 inches deep, even though the title identifies it as a California king. Because the size information conflicts, confirm the current listing’s selected size and dimensions with the seller before purchase. Do not rely on the title alone.
If the California king size and depth are confirmed, the higher stated depth limit may suit a thick mattress that falls outside the ranges of the other options. As with any encasement, make sure the zipper closes fully and follow the care instructions to avoid damaging the waterproof layer.
Pros:
- Product title indicates a deep fit of up to 20 inches.
- Waterproof lining and six-sided zippered design are described.
- Includes a Velcro zipper seal.
- Machine washable, according to the product details.
Cons:
- The supplied description refers to Queen sizing, which conflicts with the California king title.
- Confirm the exact dimensions and selected size before buying.
Verdict: Consider this option only after confirming that the listing’s selected size is California king and that its dimensions match your mattress.
How to Choose a California King Mattress Protector for Bed Bugs
Measure the Mattress Depth
California king dimensions describe the mattress surface, not its height. Measure from the bottom edge to the highest point of the mattress, including a pillow top if it is part of the mattress. Compare that measurement with the encasement’s stated depth range. A cover that is too shallow may be hard to close or put pressure on the zipper; one that is too loose may not fit securely.
Check the Mattress Size and Listing Details
Confirm that the product is available in California king, commonly listed as 72 by 84 inches. Read the size selection and product dimensions on the listing before ordering. This matters especially when a listing’s title and description do not agree about the intended mattress size.
Look for a Full Encasement and Secure Zipper
A fitted protector covers the top and sides, while an encasement surrounds the mattress on all six sides. For bed-bug concerns, look for a fully closing zipper and any stated zipper-seal features. A zipper that remains open or damaged can leave a gap, so inspect the closure when you install the cover and keep it fully closed.
Decide Whether You Need Waterproof Protection
Waterproof backing can help guard against spills, sweat, and other moisture. The products here describe different surface fabrics and linings, so consider what feel you prefer as well as the barrier. Cotton terry and knitted polyester, for example, are different surface choices; follow each product’s care instructions to help preserve its protective layer.
Consider Fabric Feel and Care
A mattress encasement stays under your sheets, but its fabric can still affect the feel of the bed. Product descriptions may call out a soft, breathable, or quiet surface. Check whether the cover is machine washable and whether it can be tumble dried. If low-heat drying is required, follow that direction rather than using a hotter setting.
Understand What an Encasement Can and Cannot Do
A suitable encasement can help contain or protect the mattress, but it does not treat an infestation throughout a bedroom. Bed bugs may be present in other places, including the bed frame and nearby furnishings. For an active infestation, use the cover as part of a broader plan and follow advice from a qualified pest-control professional.
Frequently Asked Questions
Does a mattress encasement get rid of bed bugs?
No. An encasement can help isolate the mattress when it is properly fitted and fully zipped, but it does not eliminate bed bugs elsewhere in the room. It should not replace a complete treatment plan.
Should I choose a fitted protector or a zippered encasement?
A fitted protector covers the top and sides and is often simpler to remove. A zippered encasement surrounds all six sides of the mattress, which is useful when you want full coverage. Check that the encasement fits your mattress depth.
How do I know whether a California king cover will fit?
Check the listed mattress dimensions and measure your mattress depth. California king mattresses are commonly listed as 72 by 84 inches, but depth varies. Compare your measurements with the product’s fit range before purchasing.
Can I use a mattress topper with an encasement?
Fit depends on the product’s depth range and how the topper affects the total height. If the topper sits on top of the mattress, measure the combined height and check whether the encasement can accommodate it. Do not force the zipper closed if the cover is too tight.
Are these covers waterproof?
The supplied product details describe all five options as waterproof or having a waterproof barrier. Review the specific listing and care instructions, since the construction and permitted drying methods differ.
Do I need to encase the box spring too?
A mattress encasement covers only the mattress. If you want to protect or isolate a box spring, you will need a separate cover sized for it. The SureGuard product information specifically recommends using a matching box-spring encasement for that purpose.
Final Recommendation
For a clear fit range and bed-bug-focused zipper features, the SureGuard encasement is a practical starting point if your California king mattress is 13–16 inches deep. If you need a broader fit range, compare HOSPITOLOGY PRODUCTS for mattresses up to 18 inches deep. Measure carefully before buying, and treat any encasement as one part of mattress protection—not a complete solution to a bed-bug problem.