Casper Onyx 2.0 King Mattress With Head Up Only Base
SKU: 5900068P
The Casper Onyx mattress is designed with 3 layers of foam for comfort, breathability and support. Obsessively engineered by Casper's award-winning research and development team, this mattress contains Breathe Flex Foam for support and pressure relief & Breathe Foam for air flow that pairs breathability with softness for all-night comfort. Key features include a cozy knit cover designed with added stretch so you can experience all the comfort your mattress has to offer. Features a top layer of Breathe Flex Foam that's both responsive and breathable to soothe you to sleep with the perfect bit of bounce. A firm Casper Core base provides long-lasting support while preventing sinking and sagging. Foams are certified by the CertiPUR-US program, meaning they are made without ozone depleting chemicals and regulated by the Consumer Product Safety Commission Low VOC (Volatile Organic Compound) emissions for indoor air quality (less than 0.5 parts per million). Conveniently raise or lower the head of your mattress using the RTG Sleep 2900 adjustable base with wireless remote control.
Features
Adjustable / Foam / Mattress In A Box
Collection
Casper Onyx 2.0
Q&A answers generated with AI assistance.
How does this adjustable king mattress help with lifestyle needs like reading or watching TV in bed?
This king mattress set includes the RTG Sleep 2900 adjustable base, which features a wireless remote for effortless "head-up" positioning. By elevating the head portion of the mattress, you can achieve an ergonomic angle ideal for reading, using a laptop, or watching movies without straining your neck. This elevation is also an effective, non-invasive way to help alleviate symptoms of acid reflux and reduce snoring by keeping the airways more open.
How well does this mattress minimize motion transfer for partners?
In a king-size mattress, minimizing partner disturbance is essential. The triple-layer foam construction of this mattress is inherently excellent at absorbing motion. Unlike traditional innerspring coils that can transfer bounce across the surface, these specialized foam layers isolate movement at the source, ensuring that one partner’s movements won't wake the other during the night.
Will this foam mattress feel hot, especially in humid or warm climates?
To maintain a comfortable sleep temperature, this mattress is engineered with Casper’s Breathe Foam and Breathe Flex Foam. These layers are specifically designed to promote airflow and breathability, pairing softness with a responsive feel. This advanced foam technology, combined with a stretch-knit cover, helps move heat away from the body, which is particularly beneficial for sleepers in humid climates where maintaining a cool sleep surface is a priority.
Can this adjustable base and mattress be used with an existing bed frame?
This set features a platform-style adjustable base with a 4-inch profile and sleek black legs. Because the RTG Sleep 2900 base provides the necessary structural support for the mattress, it replaces the need for a traditional box spring or foundation. It can be used as a standalone bed or placed within many standard king-sized bed frames that are compatible with adjustable bases, provided the frame’s internal dimensions accommodate the 80"L x 76"W footprint.
Is the material used in this mattress safe for indoor air quality?
You can breathe easy knowing that all foams used in this mattress are CertiPUR-US certified. This certification verifies that the mattress is made without ozone-depleting chemicals and meets strict standards for low VOC (Volatile Organic Compound) emissions for indoor air quality—specifically measuring less than 0.5 parts per million. This makes it an excellent choice for health-conscious shoppers looking to minimize chemical exposure in the home.
What measures are taken to prevent this mattress from sagging over time?
Durability is a core feature of the Onyx 2.0 series. The mattress is built upon a firm "Casper Core" base designed to provide long-lasting structural support. This high-density foundation prevents the sinking and sagging that can occur with standard foam mattresses, ensuring consistent pressure relief and proper spinal alignment for the life of the product.
80"l x 76"w x 10.50"h; adjustable base: 4"h