Front view of the South Bay EcoCore Hybrid Premium 10-inch medium mattress on a grey tufted bed frame in a modern bedroom.

Perspective view of the South Bay EcoCore Hybrid 10-inch mattress showing the white breathable top and grey patterned side fabric.

Top-down view of the EcoCore Hybrid plant-based foam mattress by South Bay on a designer platform bed frame.

Close-up corner view of the South Bay EcoCore Hybrid mattress showcasing the premium quilted cover and durable side construction.

Infographic for South Bay mattress bed-in-a-box setup instructions: unbox, unroll, and sleep within 24-48 hours.

Diagram of individually wrapped steel pocketed coils in the South Bay EcoCore Hybrid for motion isolation and enhanced airflow.

Cooling gel-infused memory foam graphic for South Bay EcoCore mattress highlighting temperature-neutral sleep and breathability.

Soy-based memory foam infographic for South Bay EcoCore Hybrid emphasizing eco-friendly, renewable, and hypoallergenic materials.

Firmness scale graphic indicating the "Medium" feel of the South Bay EcoCore Hybrid mattress, recommended for all sleeping positions.

Quality guarantee icons for South Bay mattresses including 10-year limited warranty, CertiPUR-US foam, and Assembled in USA seal.

Silhouette demonstrating the flexibility of the South Bay EcoCore Hybrid mattress on a motorized adjustable power base.

Patented edge-to-edge support technology infographic for the South Bay mattress showing 20% more usable sleeping surface.

Detailed cutaway diagram of the 10-inch South Bay EcoCore Hybrid construction layers featuring cooling gel, pocketed coils, and plant-based foam.

EcoCore Hybrid Premium Plant Based Foam - Patented Edge Support Medium 10 inch Mattress By South Bay

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EcoCore Hybrid Premium Plant Based Foam - Patented Edge Support Medium 10 inch Mattress By South Bay

$588.00

$799.00

Save $211.00

Brand:

SOUTH BAY

Size

i Size Guide

$588.00

Only 12 left in stock

Free USA Wide Delivery

10 Year Warranty

Advanced Technology

The South Bay EcoCore Hybrid Premium Mattress brings together plant-based comfort foams and responsive pocketed coil support in a sustainable 10-inch hybrid build.

Cloudy Mattress is the authorized South Bay retailer for this product, so every purchase comes with trusted sourcing and the full manufacturer's warranty. Because of this balanced response, it stands out as one of the best eco-friendly hybrid mattresses for back sleepers without sacrificing pressure relief.

Inside, four engineered components work together, beginning with bio-based foam at the surface that introduces bio-polyol plant-based foam to your sleep environment. This plant-based hybrid mattress uses open-celled soy-derived foam to create a breathable, hypoallergenic top surface that stays naturally cooler.

A plush gel-infused memory foam comfort layer beneath cradles the body, delivering cooling, sustainable comfort, and pressure relief for hips and shoulders. Furthermore, the M-Guard edge support technology reinforces the perimeter, adding roughly 20% more usable sleeping surface and steadier sitting stability.

Beneath the foam layers, individually wrapped pocketed coils form the supportive core, delivering responsive lift with reduced motion transfer for couples. This pressure-relieving hybrid construction combines the contouring feel of memory foam with the gentle bounce and breathability of an innerspring system.

At 10 inches and fully adjustable-base compatible, this is a versatile 10 inch medium hybrid mattress that pairs well with any modern foundation. The mattress is built with eco-friendly certified materials and CertiPUR-US Certified Bio-Foam, supporting an environmentally conscious sleep choice.

Additionally, it arrives via Mattress-in-a-box shipping, compressed and rolled for convenient delivery, and is backed by a 10-year manufacturer's warranty.

Plant-Based Bio-Foam Comfort

Built with bio-polyol plant-based foam derived from renewable soy, delivering an environmentally conscious sleep choice without compromising on feel.

Hybrid Coil Support

Individually wrapped pocketed coils deliver responsive support with the gentle bounce and breathability of an innerspring system.

Cooling Gel Comfort Layer

A plush gel-infused memory foam layer keeps the surface cool while contouring to hips and shoulders for cooling, sustainable comfort.

Patented Edge Support

The M-Guard edge support technology delivers a sturdy edge-to-edge sleeping surface with roughly 20% more usable space.

Motion Isolation for Couples

Pocketed coils move independently, providing reduced motion transfer for couples so partner movement is less noticeable.

Breathable, Open-Cell Foam

An open cell breathable bio-foam top layer promotes airflow through the comfort layers, supporting temperature-neutral rest.

Certified Clean Foams

All foams are CertiPUR-US Certified Bio-Foam, made without formaldehyde, phthalates, heavy metals, or ozone depleters.

Key Mattress Benefits

6 Layers
Of Cooling
Comfort

This top comfort layer is open-celled natural soy memory foam that delivers temperature-neutral breathability at the sleep surface. The bio-based content reduces reliance on petroleum-based inputs while keeping the foam hypoallergenic.

This second layer adds plush gel cooling that contours to the body's curves. As a result, sleepers benefit from cradled pressure relief at the shoulders and hips without overheating.

A reinforced perimeter is built into the mattress to extend the usable sleeping area by roughly 20%. This system also provides a stable sitting edge and extends the overall lifespan of the mattress.

This core layer is built with individually wrapped pocketed coils that deliver responsive support and gentle bounce. Furthermore, the pocketed design reduces motion transfer between partners while promoting airflow through the core.

This bottom layer provides foundational support and structural integrity beneath the coil unit. It anchors the entire mattress build and helps maintain consistent shape and performance.

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

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Hybrid coils make plant foam cooler than pure foam

Plant-based foam already breathes better than petroleum foam. The hybrid coil system adds airflow underneath that makes the thermal performance even better. Two different cooling mechanisms working together. I track sleep temperature and the EcoCore Hybrid Premium is the coolest medium mattress I've slept on. Sustainable materials and better temperature regulation. Both true.

Plant-based credentials are legitimate

I researched the plant-based foam claim before purchasing. The partial replacement of petroleum with plant-derived oils is certified reduces the carbon footprint and lowers VOC content. The mattress had essentially no off-gassing confirming the claim. South Bay didn't use eco as a marketing word - they used it as a manufacturing standard.

Plant-based hybrid is the future of mattresses

The EcoCore Hybrid Premium combines everything I care about - coil support for temperature and responsiveness plant-based foam for lower VOC content and better breathability and patented edge support for full surface use. Three months in and the medium feel is consistent the cooling is real and the plant-based foam has had no off-gassing. This is what thoughtful mattress design looks like.

10-inch hybrid on our adjustable base - perfect pairing

10-inch hybrids are ideal for adjustable bases and this one flexes perfectly at all positions. The plant-based foam cooperates with the base movement rather than resisting it and the coil airflow stays active at elevated angles. Medium feel is consistent whether flat or in zero gravity. South Bay's mattress and adjustable base working as a system.

Medium runs slightly firm for my preference

The EcoCore Hybrid Premium is excellently constructed - coils are responsive edge support is impressive and the plant foam breathes well. My personal note is the medium feel reads closer to medium-firm to me. If you're a true medium sleeper or lean toward firm you'll feel at home. If you prefer a softer medium consider that this one leans firmer. Construction quality is not the issue.

HAVE QUESTIONS?

WE'VE GOT ANSWERS

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

EcoCore is South Bay's bio-based foam line that uses renewable plant-derived materials, particularly soy, to replace a portion of the petroleum-based polyols found in traditional memory foam.

Yes, the EcoCore Hybrid Premium works well for side sleepers. The 2-inch bio-based foam top combined with the 1-inch plush gel memory foam layer cradles the shoulders and hips, while the pocketed coil core delivers the underlying support needed to keep the spine in healthy alignment.

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 a metal foundation as an add-on at checkout.

The patented edge support system reinforces the perimeter of the mattress around the coil unit. This expands the usable sleeping surface by roughly 20%, provides a steadier sitting edge when getting in and out of bed, and helps extend the mattress's overall longevity by reducing edge wear.

Yes, all foam layers 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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EcoCore Hybrid Premium Plant Based Foam - Patented Edge Support Medium 10 inch Mattress By South Bay

Product Description

Plant-Based Bio-Foam Comfort

Hybrid Coil Support

Cooling Gel Comfort Layer

Patented Edge Support

Motion Isolation for Couples

Breathable, Open-Cell Foam

Certified Clean Foams

Key Mattress Benefits

6 Layers Of Cooling Comfort

1. 2" Bio-Based Air Foam (Top Comfort Layer)

2. 1" Plush Gel-Infused Memory Foam (Cooling Comfort Layer)

3. Patented Edge Support System

4. 6" Edge-to-Edge Pocketed Coils (Support Core)

5. 1" Base Foam (Foundation Layer)

6. Zip-Off Machine-Washable Cooling Cover

CLOUDY MATTRESS IS THE SMARTER CHOICE

FASTEST SHIPPING

24 / 7 CUSTOMER SUPPORT

EXPERT GUIDANCE

BEST PRICE GUARANTEED

Customer Reviews

WE'VE GOT ANSWERS

What is the difference between EcoCore and regular foam?

Is the EcoCore Hybrid Premium good for side sleepers?

Does this 10-inch mattress require a box spring?

How does the patented edge support work?

Is the plant-based foam CertiPUR-US certified?

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