Inseparable 300 Thread Count 100% Cotton sheets are designed for beds, bunk beds, daybeds, dorms, RV's or any bed that may be against a wall or difficult to make. Choose "Left" or "Right" side opening when selecting color. The top sheet and bottom sheet goes on at the same time tucking in neatly along the wall side (there is no sheet to come untucked and hang down on the wall side of the top). Fitted sheet fits up to a 13" mattress thickness. The convenience of putting both the top and bottom sheets on at the same time, keeps the sheets neatly and securely tucked in at all times. Hand Crafted In The U.S.A.