Mattress Size Guide

Twin Xl
California King
Split King
Home Mattresses

ONYX Hybrid Firm

Graphene cooling technology and copper infusion for temperature regulation and pocketed springs for flex support.

4.5 out of 5 Stars

Learn more  about

ONYX Hybrid Firm

Graphene cooling technology and copper infusion for temperature regulation and pocketed springs for flex support.

Select a Size

Size chart

from $1,79900 ea

Free shipping | expected to ship in 5-14 days

as low as /mo with

Apply Now
Find a store near me
room temp
Very cold
The Onyx is sleeker, thinner, and firmer than the other two models in the Onyx lineup. It has a Cooling Knit Cover and utilizes the paring of Copper Gel AeroFusion™ Memory Foam and Flex Support Foam to provide the sleeper with support, isolate them from motion, and align their pressure more evenly.


Orders are processed within two business with an average delivery time between 2-5 days. Delivery times may vary depending on stock and availability. FedEx Ground ships products purchased through our website. White Glove Service and certain adjustable bases may require additional shipping time and will be scheduled with you through our team of Customer Service Specialists.


White Glove Service
Glove Service is an option for specific MLILY products that includes delivery and setup with your purchase. If purchasing a White Glove qualifying product, our team will ship your order to a delivery provider near you. Once the delivery provider receives your items (usually 5-7 days after ordering), their customer service representative will contact you directly to schedule your delivery. Orders with White Glove Services will not have a direct tracking number; however, our customer service can still assist you with any questions.


Find out more in our FAQs.

Talk with an MLILY expert or take our mattress quiz to find the best match for your sleeping needs.

Take the mattress quiz

Take a look inside

Take a look inside image
Graphene-enhanced Cooling Knit Fabric Cover
Copper Gel AeroFusion™ Memory Foam
Flex Comfort Foam
Pocketed Spring With Foam Encasement
Flex Support Foam

Graphene-enhanced Cooling Knit Fabric Cover

Infused with graphene, the cooling knit fabric not only breathes, but the air flow creates a cooling sensation keeping you comfortable while you sleep. This highly advanced fabric stays cool-to-the-touch due to its superior breathability and temperature regulating properties that move heat away from the body.

Copper Gel AeroFusion™ Memory Foam

The compressed copper and gel particles are infused into the AeroFusion Memory Foam®, forming a soft and antimicrobial film close to the human skin. It can regulate moisture and reduce odor, thus reducing the risk of skin diseases and ensuring a clean and comfortable sleep environment.

Flex Comfort Foam

This foam is often used as part of our base support top layer to seal in our Individually Pocketed Spring system in our Hybrid lines. This foam is flexible and durable, allowing for the other more specialized foams above it to shine while it supports from below.

Pocketed Spring With Foam Encasement

We manufacture our own springs to ensure that the quality matches the foam that surrounds them. The specially crafted pocketed coil system enables the mattresses to be rolled and compressed for convenient shipping. Moreover, our pocketed coils are unparalleled in their ability to provide support and adaptability, allowing the sleeper to relax and rejuvenate.

Flex Support Foam

Flex Support Foam is often the bottom layer of our mattresses. A mattress needs to provide the support needed to keep the spine aligned so the sleeper’s muscles relax instead of tightening to compensate. This high-grade foam completes the bottom of the mattress to provide long-lasting durability and support of the top layers.

How to setup your new MLILY mattress


Open box and carefully pull out rolled mattress.


Carefully cut open protective bag to remove and unroll mattress. Take care to not use a knife on the protective bag.


Place mattress on bed frame or foundation to let it expand for 24 to 48 hours.

Sweet Dreams!

Enjoy a restful night's sleep.

Woman resting in bed on her stomach with eyes closed and arm at right angle.
Find the mattress of your dreams

Not sure where to start? Take our mattress quiz to discover which MLILY mattress is best for you.