This is intex's best selling airbed and no wonder as it combines all the benefits of a raised sleeping surface, built-in pillow and integral electric pump with lightweight convenience. the perfect combination of luxurious comfort and convenience. this is a premium version of the standard pillow rest raised bed featuring the innovative high-strength dura-beam technology. unlike traditional airbed construction, these internal support beams comprise polyester fibers that do not stretch over time which improves durability and comfort. 3*6, 4*6, 5*6 6*6