Front view of the South Bay 12-inch Copper Gel Infused Medium Firm Mattress on a stylish platform bed with a tall vertical-tufted grey headboard.

Three-quarter perspective of the Copper Gel Infused 12-inch memory foam mattress by South Bay, showcasing the geometric patterned cover with copper accents.

Firmness scale graphic for the South Bay Copper Gel mattress indicating a "Medium" feel, ideal for side, stomach, and back sleepers.

Studio shot of the South Bay 12-inch Copper Gel Infused Mattress showing the white quilted top with copper-colored hexagonal patterns and a dark grey base.

Minimalist side view of the 12-inch thick Copper Gel Medium Firm Mattress by South Bay against a clean studio background.

Infographic for South Bay mattress explaining the Patented Edge to Edge technology that provides 20% more sleeping surface and reinforced sides.

Easy 3-step setup guide for the South Bay Copper Gel mattress: unbox, unroll, and sleep, showing the convenient bed-in-a-box process.

Graphic showing the flexibility of the South Bay 12-inch mattress, demonstrating full compatibility with adjustable power bed bases.

Cooling feature graphic for the South Bay Copper Gel mattress highlighting temperature-neutral sleep via gel-infused foam and articulated cuts.

Detailed cross-section diagram of the South Bay 12-inch mattress construction, featuring cooling copper memory foam and a durable Air Grid foundation.

Copper Gel Infused Medium Firm 12 inch Mattress By South Bay

Plush Medium Firm Pillow top Memory foam Hybrid

Copper Gel Infused Medium Firm 12 inch Mattress By South Bay

$599.00

$799.00

Save $200.00

Brand:

SOUTH BAY

i Size Guide

$599.00

Only 12 left in stock

Free USA Wide Delivery

10 Year Warranty

Advanced Technology

The South Bay Copper Gel 12 Inch Mattress combines cooling copper-infused comfort with structured support across a generous 12-inch profile.Cloudy Mattress is the authorized South Bay retailer for this product, so every purchase is backed by trusted sourcing and the full manufacturer warranty.

The feel sits in the medium to medium-firm range of the comfort scale, making it accessible for back, side, and stomach sleepers alike. Because of this balanced support, it ranks among the best copper infused mattress for hot sleepers seeking both contouring and reliable lift.

Inside, four engineered foam layers work together, beginning with copper-infused viscoelastic foam that delivers cooling and antimicrobial benefits at the sleep surface. The copper-infused top layer naturally helps neutralize temperatures and dissipate odors, supporting a fresher and cooler sleep environment.

Furthermore, this high-thermal conductivity cooling technology draws heat away from the body, delivering temperature-regulated deep rest through the night. A dedicated memory foam comfort layer beneath helps minimize partner disturbance, giving you a quieter, more restful night.

The supportive transition foam and Air Grid base work together to deliver targeted spinal alignment support and restorative joint pressure relief across the body. At a full 12-inch profile height, the mattress is adjustable base compatible, making this an excellent 12 inch medium firm hybrid mattress alternative.

Additionally, it arrives via Mattress-in-a-box delivery, compressed and rolled for easy unboxing and setup at home. Backed by a 10-year limited warranty, and with Affirm financing available at checkout for added flexibility.

Copper-Infused Cooling Top Layer

The copper-infused viscoelastic foam features high-thermal conductivity cooling that conducts heat away from the body for a cooler surface feel.

Antimicrobial Sleep Surface

Copper naturally delivers antimicrobial sleep surface technology that helps neutralize temperatures and creates odor-resistant mattress materials.

Pressure & Pain Relief

Multi-layered foam contours to hips and shoulders, offering restorative joint pressure relief and targeted spinal alignment support.

Reduced Motion Transfer

A dedicated memory foam comfort layer minimizes partner disturbance, making this a strong choice for couples sharing the bed.

Reinforced Edge & Base

The Air Grid base and transition layer deliver structured, long-lasting support for consistent comfort over time.

CertiPUR-US Certified Foams

Built with CertiPUR-US Certified Foam and non-toxic eco-friendly materials, made without formaldehyde, phthalates, heavy metals, or ozone depleters.

Adjustable Base Ready

Fully adjustable base compatible, this 12-inch profile pairs seamlessly with your preferred foundation.

Key Mattress Benefits

5 Layers
Of Cooling
Comfort

This top layer is the copper-infused viscoelastic foam that delivers cooling and antimicrobial properties at the sleep surface. The copper helps neutralize temperatures and dissipate odors for a cleaner, fresher feel night after night.

This second layer contours to the body and helps minimize motion transfer between partners. As a result, sleepers benefit from quieter rest and consistent body cradling across the surface.

This middle layer acts as the transition between the soft top layers and the firmer base, balancing comfort with structural lift. It supports proper alignment while reducing residual motion through the mattress.

This bottom layer forms the high-density support foam core of the mattress and reinforces overall stability. Furthermore, the grid construction promotes airflow through the core, supporting cooling and breathability from below.

The exterior cover unzips for easy laundering and helps reduce allergens with regular washing. Its breathable design supports the copper-infused cooling system at the surface of the mattress.

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Medium firm runs slightly firm for my preference

The mattress quality is clearly excellent - 12 inches of well-layered foam good edge support cool sleeping surface. My note is the medium firm reads closer to firm than medium to me personally. Side sleepers coming from a plush background may need a few weeks to adjust. The construction quality is not in question just the feel calibration relative to my expectation.

Copper has antimicrobial properties and I appreciate that

I researched copper-infused foam before buying. Copper's antimicrobial properties are well documented and having them built into the mattress surface is a genuine hygiene benefit over time. The mattress also sleeps cooler than any foam I've tried. South Bay made a smart material choice that benefits both temperature and cleanliness.

Medium firm is perfectly calibrated

Not too hard not too soft. The medium firm on this mattress is textbook - supportive enough to keep my spine aligned plush enough to relieve pressure points. I've been chasing this exact feel for years across multiple mattress purchases. South Bay landed it precisely.

My lower back pain resolved in three weeks

Orthopedic specialist recommended medium firm for my lumbar issues. The Copper Gel Infused mattress delivers exactly what she prescribed. Three weeks in the morning back pain dropped significantly and at six weeks it was essentially gone. The copper gel cooling is a bonus - I sleep through without overheating for the first time in years.

Copper gel actually keeps it cool all night

I've been skeptical of cooling claims on mattresses but the copper gel infusion on this one is real. My previous foam mattress would be warm by midnight. This one stays consistently cool throughout the night. I track my sleep temperature and the numbers back it up. Hot sleepers who need medium firm support - this is the one.

HAVE QUESTIONS?

WE'VE GOT ANSWERS

Designed for deep comfort and better rest, so you wake up refreshed and ready for the day

Copper-infused mattresses offer two primary verified benefits. First, copper has natural antimicrobial properties that help neutralize temperatures and dissipate odors. Second, copper conducts heat away from the body, which supports temperature regulation and cooler, more comfortable sleep.

This mattress is designed with multi-layered foam that contours to the body while supporting proper spinal alignment. Many sleepers find this combination helpful for general comfort and back support. However, individuals with chronic or diagnosed back conditions should consult a medical professional before making a purchase decision.

A box spring is not required. The mattress can be placed on a continuously solid surface, an adjustable base, or slats spaced no more than two inches apart. Cloudy Mattress also offers an optional box spring with metal foundation as an add-on at checkout.

Copper is a naturally heat-conductive metal, so infusing it into the top memory foam layer helps draw warmth away from the body. This conductive effect supports cooler surface temperatures and a more breathable sleep experience.

Yes, all foams in this mattress are CertiPUR-US certified. They are made without formaldehyde, phthalates, ozone depleters, heavy metals, PBDEs, or listed Tris flame retardants, and they meet low-VOC standards for healthier indoor air quality.

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