Small Single Bunk Beds Bunk Beds With Mattresses single bunk desk bunk beds with mattresses are a great option for siblings sharing a room, especially if one child is yet to experience an increase in size. The mattress is a combination of an adaptive polyfoam and memory foam pillow top layer with a shared core of pocketed coils. It's important to select a Grey Junior Vida Gemini Bunk Bed - Storage bed mattress that can comfortably accommodate all sleepers and also not exceed the frame's capacity for weight. Also, make sure that the top bunk mattress is not too thick that it can be seen over the railings. The Saatva Youth The Saatva Youth is a dual-sided innerspring mattress designed for children. It's a great option for children because it is able to adapt to their changing requirements through its dual-sided construction. It's a top-quality mattress that will last for a long time. It won't be necessary to be concerned about replacing it when your child is no longer using it.