Best Bed Bug Mattress Encasement (2026): Zippered Covers That Seal All Six Sides

Shop the full bedding category if you are still deciding between barrier types. For everyday spill protection on top only, start with our best mattress protector guide before you buy a six-sided zip cover.

An encasement does a different job from the fitted cover most people call a mattress protector. It wraps the whole mattress, then closes with a zipper. That matters when you want the sides and bottom covered as well as the sleep surface.

If you think you have an active bed bug problem, use an encasement as one part of a treatment plan from a qualified professional. The cover is a barrier. It does not diagnose an infestation or make one disappear on its own.

Start with a tape measure, not a product photo. An encasement that is too shallow stresses the zipper. One that is far too loose bunches under the sheet. Depth is the decision that actually matters.

What should a bed bug encasement do?

A good encasement seals all six sides of the mattress with a zippered closure, blocks liquids, and stays quiet enough to sleep on. It should fit your measured mattress depth, not a nominal size.

Does an encasement kill bed bugs?

No. It contains bugs already inside the mattress and stops new ones from getting in or out. That is why pest professionals pair an encasement with treatment rather than selling it as a cure. Plan to leave a quality cover on for at least a year so any trapped bugs die off.

How do you measure your mattress depth?

Measure from the bottom seam to the highest point of the top surface, including any attached pillow top. A 14-inch mattress with a 3-inch topper needs a 17-inch cover, not a 12-inch one. Do not use the depth printed on a sheet label. Then pick a cover whose stated range includes that number.

What else should you check before buying?

Look for a true six-sided design, a zipper guard or flap, and a waterproof membrane if you also want spill protection. Then check the fabric. A noisy vinyl cover is the old problem; modern knitted and terry surfaces are quieter but still add a layer.

Hot sleepers should expect a little extra warmth from any waterproof membrane. Pair a thin cover with breathable cooling sheets. That keeps the bed from running hotter than it did before.

How do the three encasements compare?

Depth is the first filter, then surface feel and warranty. All three are queen, waterproof, six-sided encasements.

SafeRest is best for a deep mattress

The SafeRest Zippered Mattress Protector is the easy first choice for a deep pillow-top, hybrid, or other tall queen mattress, with more than 17,900 buyers having rated it. It gives you more room at the corners than a 12-inch cover, so you are less likely to tug hard on the zipper during installation.

The surface uses cotton terry over a waterproof layer. That is a better bet if you dislike the smooth, synthetic feel of many inexpensive covers. You will notice the terry less under a fitted sheet, and spills still sit on the membrane instead of soaking the mattress.

Is SafeRest noisy?

Slightly, and honestly so. Wirecutter describes a light ruffling, like crumpling paper, from the thin laminate underside, but not loud enough to disturb sleep. The terry top also feels a touch scratchy before a fitted sheet goes on. Choose SafeRest if your mattress measures 15 to 18 inches deep, and skip it if your mattress is 12 inches or less and the extra depth would leave loose fabric.

Linenspa is the best value for a standard mattress

Linenspa is the practical choice when your mattress is no more than 12 inches deep. Its six-sided zippered cover is waterproof, machine washable, and backed by a 10-year limited warranty, and more than 39,000 buyers have rated it. Independent reviewers describe the surface as soft and virtually crinkle-free, with most sleepers never noticing it under the sheets. It is the strongest value pick here because you do not pay for extra material you cannot use.

Will Linenspa fit a pillow top?

Not a thick one. Do not assume it will stretch over a 14-inch pillow top just because it is flexible. A too-shallow cover puts the zipper under load and can tear at the corners. Measure first, then buy the depth that matches. The 10-year warranty also only holds if you follow the care label, since defects from harsh washing are excluded.

Utopia is the best budget 14-inch option

Utopia Bedding sits between the other two on depth. Its 14-inch queen model costs less than many premium encasements while giving you more room than a standard 12-inch cover. The fabric is a smooth knit that does not trap heat, which is the opposite of old vinyl. It ranked third in Mattress Encasements at the time of writing.

What does the knitted polyester feel like?

It feels smoother and cooler than terry, and a little more synthetic. The honest drawback is the fabric: if you are sensitive to a synthetic sleep surface, pay more for the SafeRest instead of hoping this one will feel like cotton. Fit, the full zip-around design, and leak protection are the reasons to buy it.

One note for careful shoppers: Wirecutter's spill test disqualified a Utopia fitted protector, which is a different product from this zippered encasement. Choose this one when your mattress is close to 14 inches deep and you want full coverage on a tighter budget.

How do you put an encasement on without tearing it?

An encasement is easiest to install with two people, especially on a queen or king bed. Remove sheets and any topper first. Stand the mattress on its long edge if you can do so safely, then slide the open encasement over one corner at a time.

Zip it slowly once every corner is covered. Do not pull the zipper through a tight spot by force. If the cover feels too tight before it is halfway closed, stop and check the depth range rather than risking a torn seam.

After it is closed, put your fitted sheet on top. You can also add a fitted mattress protector over the encasement. That setup leaves the full cover in place and gives you a simpler top layer to wash after a spill.

Encasement vs mattress protector

Choose by how much of the mattress you need to cover.

A mattress pad changes the feel of the bed. An encasement does not aim to add comfort. It is a barrier that stays under your sheets, so choose it for coverage and fit rather than for a plush surface.

If those terms still blur together, read our guide to mattress protector vs mattress pad. The short version is simple: an encasement wraps the mattress, a protector sits over it, and a pad adds padding. For the fuller comparison, see mattress protector vs encasement.

How long should an encasement stay on?

Leave a quality encasement on for at least a year when it is part of a treatment plan, so any trapped bugs die inside. After that, keep it on as everyday protection if you like, and replace it if the zipper opens or the fabric tears.

Follow the washing and drying directions printed on the specific cover. Waterproof membranes can be damaged by high heat or harsh bleach, even when the outer fabric looks fine. Keep a fitted sheet over the encasement and wash that sheet normally.

Check the zipper and seams when you change bedding. A six-sided barrier only works when all six sides remain covered. An encasement can support a prevention or treatment plan, but it cannot diagnose an infestation on its own. If you see signs of activity, get specific advice from a licensed pest professional.

Final take

For a thick queen mattress, buy the SafeRest Zippered Mattress Protector, Queen 15-18 Inch Deep. Its depth range and terry surface make it the most comfortable long-term pick. For a standard-height mattress, the Linenspa Encasement Waterproof Mattress Protector offers the best value. The Utopia Bedding Zippered Mattress Encasement is the budget choice when you need a little more depth.

Once the mattress is fully covered, keep the sleep surface cool and easy to wash with cooling sheets. If you only need everyday spill protection, compare the best mattress protectors before paying for a full encasement.