STEPS FOR PROPERLY UNBOXING AND SETTING UP YOUR MEMORY FOAM MATTRESS: Open the box. Slide the wrapped package out of the box, leaving the mattress inside of the plastic cover. Set entire mattress on the bed frame you intend to use (or any place you’d like while it expands into shape). Open plastic cover carefully, avoiding the use of scissors or any sharp objects on the plastic cover to avoid damage to your new mattress. Air will enter and your mattress will begin to expand and take shape. Allow 24-48 hours for the mattress to regain full shape.