This California King size 80% semi waveless waterbed mattress is very popular due to how comfortable it is. It has 6-8 seconds of movement which is less than a free flow or a standard 1 or 2 layer semi wave mattresses. It has three Layers of super soft 2 oz. Resin Bonded Fiber Specially engineered for comfort.. One 2 Oz. Layer of contouring lumbar support which aides in lower back support and help keeps your body more level. It also has a sturdy L Sure Seam Corner Construction with Reinforced Corners that provides durability and helps keep the sheets more stationary. All the fiber is connected together to help prevent shifting and sliding when draining. Mattress also comes with a fill kit and a 4oz bottle of premium conditioner. Mattress has a Lifetime Prorated Warranty. If you have any questions about this very comfortable mattress please feel free to contact us any time.. Thank-you for looking at our products. Mattress Covers Amazon Store