Product Review: Sealy 12-Inch Hybrid Bed in a Box, Medium-Firm, Queen The Sealy 12-inch Hybrid Bed in a Box is an excellent choice for those looking for a comfortable and supportive mattress. The medium-firm feel provides just the right amount of support without being too firm or soft. This bed is perfect for back sleepers as it conforms to your body's natural curves, providing optimal spinal alignment. The hybrid construction of this bed also makes it an excellent choice for those who suffer from motion sickness. The combination of memory foam and innerspring coils helps to minimize movement transfer between partners, making it a great option for couples. One downside of this bed is that it may not be the best choice for side sleepers as there isn't enough give in the mattress to support their hips and knees. Additionally, the boxed design can make it difficult to maneuver once unpacked, so it may take some time to set up. Overall, the Sealy 12-inch Hybrid Bed in a Box is an excellent choice for those looking for a comfortable and supportive mattress that will provide optimal spinal alignment and minimize motion transfer between partners.