A king-size mattress is one of the largest standard mattress sizes available, measuring 76 inches wide by 80 inches long. It provides ample space for couples or individuals who enjoy extra room to move around while sleeping. This size is ideal for larger bedrooms, offering a comfortable sleeping surface for a restful night. King-size mattresses come in various types, including memory foam, innerspring, and latex. They are often paired with king-size bed frames and bedding, ensuring a cohesive look in the bedroom. Due to their size, king mattresses can be heavier and may require special handling during setup and moving.