Firm Twin Mattress for Adults in a Box, 12 Inch Twin Bed Mattress with Extra …
Step 3: Proceed with caution! Solution: Ensure that the mattress is placed on a sturdy, flat, and non sinking support surface. Comfortable and Support:3 layer premuim foam and pocket springs design give you firm feeling, keeping body properly aligned, pressure relief & heat dissipation.How to set up the mattress.