Quality Mattress for Double size Softside Waterbed, 4′ 6″ x 6′ 3″ external size. Freeflow. 2 year Manufacturers warranty against defects. Carriage to customer included in the price. This mattress is designed to fit into a Double size softside waterbed mattress cover with foam bolsters that are 7cm from the edge at top, 17cm at the baseboard and 20cm deep. Customers are welcome to contact Better Waterbeds by e-mail or telephone for information or advice. firstname.lastname@example.org or 01952 457224.