Hunting for a comfortable and affordable mattress for your kid's room? The Mainstays 6 inch Memory Foam Mattress is perfect for bunk beds, trundle beds and day beds. The plush memory foam layer is designed to create a comfortable sleep space. The durable base foam gives the back and joints the support they need for a good night’s sleep. This bed-in-a-box conveniently ships compressed in box straight to your doorstep. Allow 48 hours for the mattress to fully expand before laying down for the night.