To ensure that the Emperor / Large Emperor Mattress topper stays in place during the night, it has elasticated straps that fit any depth of the mattress so you can easily and securely attach it to your mattress. All of our Emperor / Large Emperor Mattress Toppers are hypoallergenic and are ideal for allergy sufferers. Often hard to find in the Emperor Sizes, but here you can take your pick from super soft enhancers, the very best synthetics or the ultimate deep fill down Emperor mattress toppers. Designed to make your Emperor bed to feel even more blissful, our plump Emperor mattress toppers are the last word in luxury that means you can enjoy a soft, fresh and cloud-like sleep experience, every night.