Sheetsnthings 12″ Gel Memory Foam Triple-Layer Plush Mattress, 25 year limited warranty

Amazon.com Price:  $299.99 (as of 19/10/2017 01:22 PST- Details)

Twin: 38 inches wide x 75 inches long , Twin XL : 38 inches wide x 80 inches long
Full: 53 inches wide x 75 inches long, Queen: 60 inches wide x 80 inches long
King: 76 inches wide x 80 inches long, California king: 72 inches wide x 84 inches long