The HO Sports Bali iLand Inflatable Mat is made of the highest quality materials and is extremely durable. The secret to the Bali's stability is the ballast bags which are located under the 4 corners of the Bali. Once submerged, these ballast bags fill up with water and work amazingly well to keep the Bali from shifting side to side and from tipping. The Bali comes with its own electric pump which makes inflation a breeze. Simply plug the electric pump into your cigarette lighter or use the alligator clips (included) to attach to your boat/car battery, turn the dial to the desired PSI and push start. The electric pump will fill the Bali while you are getting the rest of your gear ready for your day on the water. The HO Sports Bali iLand Inflatable Mat features a DropStitch construction so rigid and durable you won't know it's inflatable unless you saw it being inflated.