Designed specifically for the Castaway Bed center platform.
The Castaway 31-Inch Center Platform Mattress is a custom mattress engineered to fit the concealed center platform of the Castaway Bed motorized split king system.
When the two Twin XL mattresses move apart, the Castaway Bed reveals a concealed center platform designed to hold a third mattress. This 31-inch mattress fills that space, creating a continuous sleeping surface between the two beds.
The mattress is constructed with a memory foam comfort layer combined with supportive mixed materials to provide balanced comfort while maintaining a low-profile design optimized for the center platform.
Each mattress includes a removable zippered cover that can be easily removed, machine washed, and placed back on the mattress for simple care and maintenance.
This mattress is designed specifically for the Castaway Bed center platform and is not intended for use with other beds.
Castaway 31-Inch Center Platform Mattress
What people are saying
The reaction speaks for itself.
This is genius!
Jackie Young
TikTok
This should be in every single hotel.
Nina
TikTok
Take my money!
alexistcsmith
Engineered for stability and everyday use.
Discover the craftsmanship and care behind every piece.
Solid platform mattress support
Each Twin XL frame uses a reinforced platform base to create a completely flat, stable sleep surface without slats. No flex, no gaps — just solid, sturdy support every night.
Stabilized center platform
The concealed center mattress rests on a stabilized platform designed to remain aligned and secure when the bed is open. It stays in place whether someone is sleeping on it or not.
Concealed push-to-operate controls
Controls are located on the back of the integrated nightstand and operate only while pressed — for safe, slow, and controlled movement. The bed moves while you hold, and stops the moment you release.
Space, reimagined.
Compare open and closed configurations to see how the bed expands when you need it and stays compact when you don't.
Room to Expand
When opened, Castaway separates into two Twin XL sleep platforms with a concealed center mattress between them. The bed expands to 146.5 inches wide.
Compact King Footprint
In the closed position, Castaway looks and feels like a traditional king bed. The center platform is completely concealed between the two Twin XL frames.
For professionals
Designing for a client?
Custom colors and configurations are available for interior designers and hospitality partners.
Learn more
Our mattress partner
Castaway × Pillow Cube
While Castaway is designed to work with any standard Twin XL mattress, we partnered with Pillow Cube as our preferred mattress provider because we share a similar philosophy around sleep. Both brands were built around the idea that better rest starts with understanding how people actually sleep, not just how beds have traditionally been designed. Together, we are creating a more intentional and personalized sleep experience for modern couples.
Included with every order
White-glove delivery & setup
Our team handles everything from scheduling to full in-home setup. You don't lift a finger.
Place your order
Choose your configuration and complete your purchase online.
Schedule delivery
Our team contacts you to coordinate a convenient delivery window.
In-home setup
Your Castaway Bed is delivered and assembled in your home, ready to use.
Ongoing support
Questions before or after delivery? Our team is here to help.
Designed for everything. Ready for anything.
Wherever life takes you, Castaway adapts.
Common questions
Answers to the most common questions about Castaway Bed, from everyday use to delivery.
