The Pop-Up unit by Glideaway is designed to save space in your bedroom by allowing a twin mattress to be lowered and simply wheeled under another bed to be out of the way. Generally used with a daybed but can also be used with many twin and full beds that allow under bed storage. With four steel cross beams supporting the spring unit, your twin mattress will be well supported. The unit comes with four caster wheels for easy sliding in and out of storage. Perfect for your guest room or for sleep overs in your kids room.