Firm King Size Mattress 14 in Memory Foam Mattress - Cool Support

In this review of the Firm King Size Mattress the bottom line is clear: this bed is best for sleepers who need solid, consistent support and prefer a cool-feeling memory foam surface. The mattress arrives compressed in a box and expands within hours, and its signature feature is a breathable cooling knit fabric cover paired with copper-infused memory foam that cradles the body while resisting heat buildup. For anyone with back pain or who wants a firmer sleep surface that still cushions pressure points, this mattress delivers reliable support without a plush sink.

Key Features

• Cooling Knit Fabric Cover: The cover stays cool-to-the-touch and helps move heat away from the body for a more comfortable night.
• Copper Memory Foam: The copper-infused layer contours to the body to reduce pressure and minimize tossing and turning.
• Two-layer Memory Foam Construction: A supportive base with a responsive top layer provides a firm feel that still cushions key pressure points.
• CertiPUR-US & Oeko-Tex Certified: Foams and fabrics are independently tested to be free from harmful substances for safer indoor use.
• Easy Setup: The mattress ships compressed, fits standard frames and expands to its full size in about 12 hours.
• 10-Year Limited Warranty: Warranty coverage offers added peace of mind for long-term use when cared for properly.

Who It's For

The Firm King Size Mattress suits back sleepers and combination sleepers who need firm spinal support and prefer minimal sink. It is also a good fit for those who sleep warm, since the cooling knit fabric cover and breathable foam aim to regulate temperature.

Side sleepers who require a very plush top layer for shoulder cushioning may want a softer mattress, and anyone who needs a removable or washable cover should consider other models since this mattress is described with a fixed knit cover and is not intended for return once opened.

Pros & Cons

Pros

• Firm, stable support that helps alleviate back and hip discomfort for many users.
• Cooling knit fabric keeps the surface feeling breathable and helps sweat evaporate.
• Certified foams give confidence about chemical safety and manufacturing standards.
• Simple setup and compatibility with standard frames and adjustable bases.

Cons

• Firm feel may be too hard for strict side sleepers who need extra shoulder relief.
• Mattress cannot be returned once opened, so initial expansion and trial is limited.

Specifications

Product type	14 in memory foam mattress
Size	76x80 in (King)
Cover	Cooling knit fabric cover
Foam layers	Two-layer memory foam with copper infusion
Certifications	CertiPUR-US and Oeko-Tex Standard 100
Origin	Made in the USA of US foam
Warranty	10-year limited warranty

Our Verdict

The Firm King Size Mattress is a strong choice for sleepers who prioritize firm support and cooler sleep. Its cooling knit cover and copper memory foam offer a balance of pressure relief and temperature regulation, making it good value for anyone seeking a durable, supportive memory foam bed. Those needing a plush top layer should look elsewhere, but for back support and stability this mattress performs well.

Frequently Asked Questions

How long does it take to expand?
The mattress typically expands to shape within about 12 hours after unboxing, though full settling may take slightly longer.

Is the mattress suitable for adjustable bases?
Yes, it is compatible with adjustable beds, box springs, slatted platforms and flat foundations.

Is there an odor after opening?
Customers report minimal initial smell; certified foams and airing for a few hours usually resolves any minor odor.