California King Mattress 6 in Gel Memory Foam - Medium Firm

Our review of the California King Mattress 6 in Gel Memory Foam finds it best suited for sleepers who want a cooler, pressure-relieving surface in a compact, easy-to-ship package. The single biggest reason to consider this mattress is its layered memory foam construction with a cooling gel layer that balances contouring comfort and stable support, making it a solid pick for back or combination sleepers who prefer a medium firm feel. The removable, washable cover and CertiPUR-US safety credentials are practical extras that add confidence for everyday use.

Key Features

• Three-layer memory foam: Layers with distinct functions combine to absorb and evenly distribute body pressure for reduced reaction force and muscle relaxation.
• Cooling gel layer: A special gel memory foam layer dissipates heat to help maintain a cooler sleep surface night after night.
• Stable support: High-density foam base and breathable comfort foam keep support consistent across normal room temperatures and reduce pressure points.
• Removable washable cover: The zip-off fireproof cloth cover makes cleaning straightforward and helps keep the sleep surface fresh.
• Compact delivery: The mattress ships compressed in a box and expands to 84 in x 72 in x 6 in within 24-72 hours for easy setup in most frames.

Who It's For

This mattress is a good match for adults who want a medium firm feel that molds to the body without excessive sink, particularly back and combination sleepers who need pressure relief and motion isolation. Its cooling gel layer and breathable knit top make it suited for people who run slightly warm at night.

Those who need deep edge support, a very thick profile, or advanced motion articulation for certain adjustable frames should look elsewhere; one customer report noted noticeable sag on an adjustable base, so users with unusual frame requirements may prefer a different model.

Pros & Cons

Pros

• Comfortable medium firm feel that improves sleep quality for many users.
• Cooling gel memory foam helps dissipate heat and reduces nighttime overheating.
• Removable, washable cover simplifies maintenance and keeps the mattress hygienic.
• CertiPUR-US compliant foam gives reassurance about safety and material quality.

Cons

• At 6 in thickness, it can sag on some adjustable frames or feel thin for those who prefer a tall mattress.

Specifications

Size	California king (84 in x 72 in)
Thickness	6 in
Construction	Three-layer memory foam with cooling gel layer
Firmness	Medium firm
Cover	Removable washable fireproof cloth cover
Certifications	CertiPUR-US compliant foam

Our Verdict

The California King 6 in Gel Memory Foam mattress is a practical, value-oriented option for sleepers who want pressure relief, cooling performance, and a medium firm feel without the bulk of a thicker mattress. Its removable cover and CertiPUR-US compliance add everyday value, though buyers who need extra thickness or guaranteed performance on adjustable frames should compare other models first.

Frequently Asked Questions

How long until the mattress is ready to sleep on?
The mattress typically expands within 24-72 hours after unboxing and cutting the protective film; allow full expansion before heavy use.

Is the cover washable?
Yes, the mattress has a removable zip-off cover designed to be machine washable for easier cleaning.

Is the foam safe for sensitive users?
The foam meets CertiPUR-US requirements and contains no fiberglass, making it safe for most users including pregnant women.