GRT California King Rayon Bamboo Waterproof Mattress Protector

The GRT Rayon bamboo Waterproof Mattress Protector is a California King fitted cover with a rayon-from-bamboo and polyester surface, a waterproof claim, and a deep-pocket fit. Its listed pocket range is unusually broad, while customer feedback is divided on both water resistance and cooling, so those are important expectations to weigh.

At a glance

Fitted, stretchy skirt is claimed to fit mattresses from 8 to 26 inches deep.
Surface is listed as 60% polyester and 40% rayon made from bamboo.
The listing describes a double waterproof membrane and a quiet 3D air fabric surface.
Machine washing is specified. Tumble drying is advised on low temperature in the feature description.

Price

$31.97Save 20%

Reference price: ~~$39.99~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

The wide stated pocket range may suit California King mattresses with greater depth than standard fitted covers accommodate.
Machine-wash care is specified, and the fabric surface includes rayon made from bamboo.

Technical specifications

11 specifications

Identity and fit
Brand	GRT
Model	GRT Rayon bamboo Waterproof Mattress Protector
Size	California King
Pocket fit claim	8"- 26" mattresses
Closure	Pull On
Color	White

Materials and protection
Surface material	Surface: 60% Polyester + 40% Rayon Made from Bamboo
Water resistance listed	Waterproof
Listed features	Breathable, Cooling, Stain Protection, Washable, Water Proof
Thread count	500

Care
Care instructions	Machine Wash

What to know before buying

Listing details to confirm

Customer reports are mixed on whether the cover reliably resists water and whether it feels cooling. Treat those outcomes as uncertain for your needs rather than guaranteed by the listing.

Who is it for?

A good fit for

California King owners seeking a fitted protector with a stated 8-to-26-inch mattress-depth range.
Buyers who want a machine-washable cover with a polyester and bamboo-rayon surface.

Less suited to

Shoppers who require consistently confirmed spill protection or a reliably cooling feel, given the mixed customer feedback.

GRT California King Rayon Bamboo Waterproof Mattress Protector · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 1,886 ratings

5 stars77%77%
4 stars12%12%
3 stars5%5%
2 stars2%2%
1 star4%4%

Customer feedback highlights positive impressions of fit, softness, comfort, and protection from spills, but reports on water resistance and cooling are mixed. That matters because the protector is listed as waterproof and cooling, yet those performance claims do not settle the differing customer experiences. Aggregate ratings lean positive overall, but cannot explain why individual customers rated it as they did.

Positive themes

Customers praise the fit on larger beds and say the cover stays in place.
Softness, comfort, and protection from spills are also reported strengths.

Mixed feedback

Customers disagree about whether it is waterproof, with some reporting strong protection and others saying it does not resist water.
Cooling impressions differ, from cool to the touch to not very cooling.

Frequently asked questions

What mattress sizes is this protector listed for?

The stated size is California King. Its stretchy fitted skirt is claimed to fit mattresses from 8 to 26 inches deep.

What is the surface made from?

The listed surface is 60% polyester and 40% rayon made from bamboo.

Can it be machine washed?

Yes. The care field says Machine Wash. The feature description also advises tumble drying at low temperature.

How dependable is its water resistance?

The listing labels it waterproof, but customer feedback includes both positive and negative experiences with water resistance. The supplied information does not establish a consistent result.