Precisely what is a hotel fitted sheet? Fitted sheets in hotels have four pocketed corners with a sewn-in elastic cord, which wraps snugly over the mattress. These bottom sheets are the protective covering that goes over your mattress or mattress pad. Sometimes fitted sheets use a drawstring to secured on to the bed instead of elastic. Its purpose is to cover and protect the mattress so that your guest enjoys a soft, clean sleeping surface. Beyond mattress size, hoteliers need to know if they want percale or sateen weave, what thread count, and, most importantly, pocket depth to choose the correct fitted sheet. Hotels for Humanity offers a variety of brands and collections, including 1888 Mills.