14 in Firm King Size Mattress in a Box - Copper Memory Foam

Our review of the 14 in Firm King Size Mattress in a Box finds it best suited for sleepers who need firm, reliable spinal support and cooler nights without chemical concerns. The single biggest reason to consider this mattress is its combination of a firm core feel with a copper-infused memory foam layer and a graphene knit cooling cover that together deliver pressure relief for the back while reducing heat buildup. Setup is straightforward from the compact box, and certifications for material safety make it a sensible choice for health-conscious buyers.

Key Features

• Cooling Graphene Cover: The graphene knit fabric cover wicks away heat and moisture so sleepers feel cooler through the night and the hidden zipper makes cover removal easy for cleaning.
• Copper-Infused Memory Foam: The Aerofusion copper memory foam contours to the body to relieve pressure points while copper helps control odors and may reduce skin irritation.
• Firm Support Profile: A firm overall feel provides stable spinal alignment and is particularly supportive for people with back pain or heavier sleepers.
• Effortless Setup: The mattress ships compressed and rolled in a box and expands to its full 14 in profile within 24 hours after unboxing.
• Health & Safety Certifications: CertiPUR-US and Oeko-Tex Standard 100 certifications mean the foams and fabrics are tested for harmful chemicals and VOCs.
• 10-Year Limited Warranty: The included warranty offers long-term protection against manufacturing defects for added peace of mind.

Who It's For

This mattress is ideal for adults who prefer a firm sleep surface and need dependable support for back pain or joint discomfort; the copper memory foam adds a contouring top layer without a plush, sinking sensation. It also suits couples who value a cooler sleep environment thanks to the graphene cover's moisture-wicking and heat-dispersing properties.

Those who prefer a very soft or pillow-top feel, or shoppers who need a mattress they can return after opening, should look elsewhere; these mattresses cannot be returned once unboxed. Shoppers wanting an innerspring bounce should also consider other constructions.

Pros & Cons

Pros

• Firm, supportive sleep surface that helps maintain spinal alignment and reduce morning back pain.
• Cooling graphene cover and breathable foam layers minimize heat retention compared with traditional memory foam.
• Copper-infused memory foam offers pressure relief while helping control odors and potential skin irritation.
• CertiPUR-US and Oeko-Tex certifications provide assurance about low VOCs and material safety.

Cons

• Firm profile may be too hard for side sleepers who need more contouring and pressure relief at shoulders and hips.
• Durability feedback is mixed among customers, so long-term life may vary by use and base support.

Specifications

Size	King (76in x 80in)
Height	14 in
Firmness	Firm
Comfort Layer	Copper-infused Aerofusion memory foam
Cover	Graphene knit cooling cover with hidden zipper
Certifications	CertiPUR-US, Oeko-Tex Standard 100
Warranty	10-year limited warranty

Our Verdict

The 14 in Firm King Size Mattress is a strong choice for back sleepers and anyone with back pain who needs a firm, supportive surface combined with cooling features and certified foams. It represents solid value for shoppers seeking a durable, chemically tested foam mattress, provided they accept the firm feel and the no-return policy after opening.

Frequently Asked Questions

How long does it take to expand after unboxing?
Allow up to 24 hours for full expansion; it will be usable sooner but reaches full shape within a day.

Can the cover be removed for washing?
Yes, the graphene knit cover has a hidden zipper for easy removal and cleaning without flipping the mattress.

Is this mattress safe for sensitive sleepers?
Yes, the foams and fabrics are CertiPUR-US and Oeko-Tex Standard 100 certified, indicating they are tested for low VOCs and harmful substances.