The hybrid mattress is made of silica gel-infused memory foam combined with The 5-zone pocket springs, which are surrounded by 4" of support foam at their edges for easy and comfortable sitting without slipping. The true hybrid design also increases durability, to create a medium-firm feel sleeping experience designed for all sleeper types and provides suitable support for each sleeping position. This keeps your body and spine aligned and distributes even weight pressure relief to your body. Plus, thanks to the breathable design and hypoallergenic materials, it's great for even sensitive sleepers. This mattress arrives compressed in a box, so we recommend giving it time to expand. Best of all, it's protected by a 10-year warranty.