Patented design specifically for hosiptal beds stays in place even when head or foot of bed is raised. Comfortable, 100% cotton. Special knit construction and 2-way stretch keeps sheets smooth and wrinkle-free - never needs ironing. The contoured bottom sheet has "envelope" design corners that wrap deeply around the mattress for a smooth, secure fit that will not slip off and stretches to accommodate mattress overlays. The semi-fitted top sheet is designed with two contoured corners to keep the bed tbed tidy and has a "Foot-Ease" fold at the end of the sheet that provides extra foot room and reduces pressure on the heels. Machine wash and dry, bleachable. White.