twin
Twin mattresses are the smallest standard size, measuring 38 inches wide by 75 inches long. They are perfect for children, bunk beds, or small bedrooms where space is limited. Twin beds are a practical choice for growing kids transitioning from a toddler bed, and they’re also often used in dorm rooms or daybeds. Their compact size makes them affordable, easy to move, and versatile for tight spaces or multipurpose rooms.