Comfytex Luxury Superior Microfiber Diamond Quilted Mattress Topper (King (70.9in x 78in)) (White) Please note: This product is a UK import, this mattress topper supplied is slightly smaller than the standard US duvet size, it will fit but the topper may fold at the edge when covered. Diamond quilted bed topper. Elasticated straps to help with fitting. Luxury 190 thread count microfiber. Choice of 4 sizes: Twin (35.4 x 74.8in), Double (53.9 x 74.8in), Queen (59.8 x 78in), and King (70.9 x 78in).