One Of A Kind: Unlike sheet strap type products, Rubber Hugger fits around the entire circumference of the mattress, securing the bottom fitted sheet and is conveniently hidden by your comforter. The Primary Purpose: The band was primarily designed as a hassle-free way to keep your bottom fitted sheet from riding up off the corners and to keep bedding from having to be tucked under the mattress at the foot of the bed, not on the sides.