Quality tested 21.2 gauge waterproof flocked top * 15 gauge vinyl sides and botom * Mattress is raised 18" from the floor for convenience * Mattress quickly and easily inflates with a high-powered built-in pump * Location, temperature, and humidity will affect the firmness of the airbed. Airbeds will need to be occasionally re-inflated (topped off) to maintain desired firmness when used for more than a few days as vinyl tends to relax over time. * Measurements will vary based on the way in which the customer inflates the airbed. Airbeds are measured from the widest point including the beams (bulges) on the side and off the tallest point from the floor including built-in pillows if applicable.