The Comfort-Top airbed is constructed with a unique electronic welding technique that interconnects welds running both the length and width of the airbed. This helps minimize sagging, dipping, lateral sway and the "see-saw" effect common on less expensive mattresses. Plush, waterproof flocking covers the mattress top and sides for a more luxurious look and feel. Quality tested 20.8 gauge waterproof flocked top with 14 gauge vinyl beams and 16 gauge vinyl bottom .Easily inflates and deflates with just a touch of a button. The high-powered built-in electric pump uses 4 x D-Cell. Measures 9" thick for extra soft comfort and the mattresses are conventional sizes for more sleeping area and a better fit for sheets.