A king mattress cover with a zipper surrounds more of the mattress than a fitted protector, helping shield its sides and underside as well as the sleeping surface. The Utopia Bedding encasement is best for mattresses up to 15 inches deep, while the CrystalTowels option fits up to 16 inches. SureGuard is suited to shoppers seeking a deeper 17–20-inch fit and bed bug protection. The bamboo-blend cover emphasizes soft fabric, and SafeRest is a possible option to investigate, though its supplied listing does not confirm a zipper.
| Product | Best for | Key detail |
|---|---|---|
| Utopia Bedding | Everyday encasement | Fits mattresses up to 15 inches deep |
| CrystalTowels | Quiet, breathable coverage | Six-sided zippered design |
| DreamField Linen | Bamboo-blend fabric | 40% bamboo |
| SureGuard | Deeper mattresses | Fits 17–20 inches deep |
| SafeRest Sleepure | Shoppers comparing waterproof covers | Supplied details do not confirm a zipper |
Utopia Bedding Zippered King Protector
Best for: Shoppers who want a fully enclosed waterproof cover for a standard-depth king mattress. The listed fit is 78 by 80 inches and up to 15 inches deep, so check mattress depth before choosing it.
The product features describe 360-degree coverage, a wrap-around zipper, and stretchy fabric intended to stay in place. Smooth knitted polyester is described as soft, durable, and non-crinkling, which may suit people who want an encasement that stays quiet beneath sheets. It was selected for its clear dimensions and combination of waterproof protection and full-side coverage.
Limitation: It is specified for mattresses up to 15 inches deep; a thicker mattress may need a different size.
CrystalTowels Six-Sided King Encasement
Best for: Buyers seeking a breathable, quiet-feeling cover with a stated fit for king mattresses up to 16 inches deep. Its six-sided zippered design surrounds the mattress, rather than covering only the top like a fitted protector.
The listed TPU waterproof layer is intended to help block spills, perspiration, and everyday moisture. The polyester fabric is described as breathable and smooth, with a design intended to avoid plastic crinkling noise. The product is also described as machine washable, a useful feature to consider when planning routine care. It was selected for its combination of a full encasement, stated depth range, and washable construction.
Limitation: The supplied information does not specify a deeper fit than 16 inches, so measure first if your mattress is unusually thick.
DreamField Bamboo-Blend Mattress Cover
Best for: Shoppers prioritizing a bamboo-blend fabric and a zippered cover that encloses both the top and bottom of the mattress. The listed material is 40% bamboo, and the king size measures 78 by 80 inches.
The product is described as waterproof, breathable, noiseless, and made with soft jacquard fabric. Its zipper goes around the mattress, and the cover is described as stretchable with a protected zipper. The listing says it is designed for latex, memory foam, and innerspring mattresses; check the fit and care details for your specific mattress before buying. It was selected for buyers comparing fabric composition and full encasement coverage.
Limitation: The supplied features do not state a maximum mattress depth, so confirm that measurement with the seller before ordering.
SureGuard Deep King Mattress Encasement
Best for: Buyers with a 17–20-inch-deep king mattress who want six-sided waterproof coverage and a listing that specifically identifies bed bug protection.
SureGuard says its cover blocks perspiration, bed wetting, liquids, stains, dust, dirt, and dander. Its product details describe a fine zipper with Invisi-Zip and SureSeal technology intended to seal off the mattress from bed bugs. The listing also recommends using a separate fitted SureGuard Mattress Protector over the encasement for frequent accidents and easier cleanup. That care note is relevant for households expecting regular spills.
Limitation: The listing advises adding a fitted protector for frequent accidents; the encasement alone may not be the easiest surface for repeated cleanup.
SafeRest Sleepure Waterproof King Protector
Best for: Shoppers comparing a waterproof king-size SafeRest product before confirming whether it meets the need for a zippered encasement. The supplied product name identifies it as a waterproof mattress protector, but no features were provided.
Because the available details do not establish its closure type, material, depth range, or care instructions, this product is less clearly matched to a search for a king mattress cover with a zipper than the other options. It is included as a comparison candidate, not as a confirmed zippered encasement. Check the full listing for a zipper and six-sided coverage before purchasing.
Limitation: The supplied information does not confirm that this protector has a zipper, so avoid choosing it until that detail is verified.
Buying Guide: How to Choose a King Mattress Cover With a Zipper
What measurements should you check?
Start with the mattress length and width, then measure its depth from the bottom to the top, including any pillow top or other permanent layer. Many king options listed here measure 78 by 80 inches, but their maximum depths differ. A cover that is too shallow may be difficult to close or may not fit as intended.
Do you need six-sided coverage?
A zippered encasement is designed to surround the mattress, including its sides and underside. This differs from a fitted protector that covers the top and uses elastic around the edges. If complete enclosure is important, look for explicit wording such as “six-sided” or “fully encasing,” and check how the zipper closes.
Which features matter for spills or bed bugs?
For everyday moisture protection, compare the stated waterproof layer and coverage. If bed bug protection is a priority, choose a product whose listing explicitly makes that claim and describes its zipper closure. Do not assume every waterproof cover blocks bed bugs. Follow the product’s instructions, including any guidance about box spring encasements or an additional fitted protector.
How should fabric and cleaning affect your choice?
Fabric descriptions can help narrow options: the listings here mention knitted polyester, breathable polyester, and a 40% bamboo blend. Claims such as quiet, soft, or breathable are product descriptions, not guarantees of personal comfort. Check washing instructions before purchase; only the CrystalTowels listing supplied here specifically states that it is machine washable.
Frequently Asked Questions
What is the difference between a zippered encasement and a fitted protector?
A zippered encasement surrounds the mattress and closes with a zipper. A fitted protector generally covers the top and secures around the edges, leaving more of the mattress unenclosed.
How deep should a king mattress cover be?
Choose a cover whose stated maximum depth is at least as deep as your measured mattress. Compare the product’s depth limit with the full mattress thickness before ordering.
Are all waterproof mattress covers bed bug proof?
No. Waterproof protection and bed bug protection are separate claims. Look for explicit bed bug wording and details about the closure rather than inferring protection from the word “waterproof.”
Can I put a fitted protector over a zippered encasement?
Yes, a fitted protector can be used over an encasement if the product instructions allow it. SureGuard’s listing specifically recommends an additional fitted protector for frequent accidents and easier cleanup.