Amazon Basics Waterproof King Mattress Protector

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Product guide

Amazon Basics Waterproof King Mattress Protector

Amazon Basics Waterproof King Mattress Protector is a fitted-sheet-style cover with a cotton-terry surface and a claimed waterproof membrane. Its machine-washable design and stated fit for mattresses up to 18 inches deep suit buyers seeking a washable layer against spills, though customer feedback reports mixed experiences with water resistance.

At a glance

Fitted-sheet-style format is intended to fit mattresses up to 18 inches deep.
Listing describes a cotton-terry surface over a waterproof, breathable and quiet membrane.
Machine-washable care makes routine cleaning possible without treating it as a disposable barrier.

Price

$34.44Save 19%

Reference price: ~~$42.46~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

King size and the stated 18-inch depth limit provide a clear fit target for many standard mattresses.
The fitted-sheet-style design avoids a zippered enclosure.
Customer feedback describes softness, comfort and fit positively overall.

Cons

Water-resistance experiences are mixed in customer feedback, so buyers relying on spill protection should weigh that uncertainty.

Technical specifications

19 specifications

Identity
Brand	Amazon Basics
Model	AmazonBasics Waterproof, Mattress Protector, King (12-18) inch

Dimensions and installation
Size	King
Weight listed	0.95 kg
Design	Fitted-sheet-style design
Maximum mattress depth stated	fits any type of mattress up to 18 inches deep

Materials and protection
Material listed	Cotton
Fabric composition listed	80% Cotton
Water resistance listed	Waterproof
Surface and barrier described	Hypoallergenic cotton-terry surface; waterproof, breathable, quiet membrane barrier
Special feature	Hypoallergenic
Other stated protection	Protects mattress from dust mites, allergens, bacteria, and liquid spills
Vinyl and PVC	Vinyl-, and PVC-free

Care and other details
Care instructions	Machine Wash
Closure type	Pull On
Colour	White
Thread count	50
Age range	Adult
Certification-related claim	Made in OEKO-TEX Standard 100 factory, an independent certification system that ensures textiles meet high safety and environmental standards.

What to know before buying

Listing details to confirm

The title specifies King, 76"X80"+18”, while the model name says King (12-18) inch and the feature text says mattresses up to 18 inches deep. These depth and sizing details are inconsistent, and the listing's waterproof, breathable, quiet and protection claims are not independently confirmed. Check the selected size and mattress-depth fit before buying.

Who is it for?

A good fit for

King-bed owners wanting a fitted, machine-washable mattress-cover layer.
Buyers who prefer a cotton-terry surface and a listing-claimed barrier against liquid spills and allergens.
Households with children or pets seeking a mattress protector, as suggested by the listing.

Less suited to

Buyers who need consistently confirmed water resistance, since customer experiences on this point are mixed.
Shoppers seeking a zippered, fully enclosed mattress encasement.

Amazon Basics Waterproof King Mattress Protector · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 9,746 ratings

5 stars71%71%
4 stars17%17%
3 stars7%7%
2 stars2%2%
1 star3%3%

Customer feedback highlights positive impressions of fit, quality, softness, comfort and mattress protection. That fits the product's intended role as a fitted, washable cover, but opinions on water resistance are mixed, which matters most for buyers depending on the claimed spill barrier. Aggregate ratings are mostly favourable, though ratings alone do not establish how the protector performs for a particular mattress or spill.

Positive themes

Feedback describes the fit, softness and comfort positively.
Customers also report satisfaction with quality and mattress protection.

Mixed feedback

Water resistance receives mixed feedback.

Frequently asked questions

What mattress depth does this protector fit?

The feature text says it fits mattresses up to 18 inches deep, but the model name gives a 12-18 inch range and the title states 76"X80"+18”. Confirm the selected listing's dimensions and depth fit.

Is this protector machine washable?

Yes. The care information says Machine Wash. The listing does not provide further washing-temperature or drying instructions.

How reliable is its water resistance?

The listing describes it as waterproof, but customer feedback reports mixed experiences with water resistance. Treat the performance as a stated claim rather than a guarantee.

Does it have a zipper?

The listing describes a fitted-sheet-style design and gives the closure type as Pull On. It does not describe a zippered enclosure.