Cal King Waterproof Mattress Protector Rayon Bamboo - Cooling, Deep

In this review of the Cal King Waterproof Mattress Protector from GRT, the bottom line is simple: it is a practical protector for anyone who needs reliable waterproofing without sacrificing comfort. The top layer uses 40% rayon from bamboo to help dissipate body heat, while a double waterproof membrane keeps liquids away from the mattress. For households with kids, pets, allergies or incontinence concerns, this protector balances breathability and protection so the mattress stays clean and sleep remains comfortable.

Key Features

• Breathable rayon bamboo top: The 40% rayon from bamboo surface helps dissipate body heat and maintain a more even sleeping temperature for better comfort.
• Double waterproof membrane: A two-layer waterproof barrier is designed to prevent liquids from reaching the mattress, protecting it from spills and accidents.
• 3D air fabric quilting: The 3D air design and quilting promote air circulation and reduce the plastic-like noise common in lesser protectors.
• Deep stretchy skirt: The elastic skirt stretches to fit mattresses from 8' to 21' deep and holds the cover in place on thick beds.
• Machine washable durability: The protector is made to retain waterproofing after washing when laundered on a gentle cycle and tumbled low.

Who It's For

This protector suits sleepers who want a balance between protection and comfort: families with children, pet owners, and caregivers for elderly or incontinent people will appreciate the waterproof barrier and the quiet, soft top layer. Its cooling properties and breathable bamboo blend also make it a useful choice for warm sleepers who want less heat retention than a standard plastic-backed protector.

Shoppers who prioritize an ultra-luxury mattress pad feel or those who want a fitted topper with extra cushioning should look elsewhere, because this product is designed to protect and remain thin and breathable rather than add significant loft or plushness.

Pros & Cons

Pros

• Soft, bamboo-blend top layer improves comfort and reduces clamminess compared with typical plastic-backed protectors.
• Reliable waterproofing from a tested double membrane keeps the mattress clean from spills and accidents.
• Deep pocket design fits mattresses 8' to 21' thick and stays in place with a stretchy skirt.
• Machine washable construction maintains function when cared for per instructions.

Cons

• Cooling effect receives mixed feedback from users, so very warm sleepers may not find it as cooling as a specialized cooling mattress cover.
• Care instructions require gentle washing and low tumble drying to preserve waterproofing.

Specifications

Our Verdict

The GRT Cal King Waterproof Mattress Protector is a solid value for anyone needing dependable waterproof protection with a soft, breathable bamboo-blend surface. It is especially well suited to households with children, pets, or caregiving needs, and it holds securely on very deep mattresses. For shoppers seeking a plush mattress topper or extreme cooling technology, other specialized products will be a better fit.

Frequently Asked Questions

Will this protector make my bed noisy like plastic?
The 3D air fabric and quilting are designed to eliminate the typical crinkly plastic sound, so users report a quiet, cloth-like feel.

Can it fit a very thick mattress?
Yes, the elastic skirt stretches to accommodate mattresses from 8' to 21' deep and helps keep the cover from slipping.

How should I wash it?
Machine wash on a gentle cycle, tumble dry low below 30 degrees Celsius, and do not iron to preserve the waterproof membrane.