The Feather Bed topper from Northern Feather is encased in a 100% cotton cambric shell and is placed on top of the mattress. Elastic is at each corner of the topper making it easy to attach and detach from the mattress. The luxurious feel is given to the topper through its layer of down at the top of the topper and the firmness is given through a layer of feather at the base of the mattress topper.