A full mattress, also known as a double mattress, measures 54 inches wide by 75 inches long. It provides enough space for a single sleeper to stretch out comfortably or for two people to share, though it may feel a bit snug for couples. This size is popular for guest rooms, smaller bedrooms, or for individuals who prefer extra sleeping space. Full mattresses are compatible with various bed frames and can accommodate different types of bedding, including sheets and comforters designed specifically for this size. They are available in various materials, such as memory foam, innerspring, and latex, catering to different comfort preferences and sleep styles.