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Choosing a Bunk Bed Mattress Single Adults and children can sleep safely on bunk beds that are designed to accommodate Twin-over-Twin, Full-overFull, or Queen mattresses. The mattress you choose should offer excellent contouring support in order to alleviate pressure points. This affordable bunk bed mattress features contouring memory foam and durable innersprings. This mattress is an excellent choice for those who suffer from allergies, since it's made of GOTS-certified organic wool and layers of breathable cotton.