Twin XL mattresses (also called extra long twin) measure approximately 39"W x 80"L, which is 5" longer than a standard twin. They are often used in dorm rooms because the extra length accommodates taller teens and young adults, and the compact width works well in smaller spaces. At home, an extra long twin mattress could be a good choice for smaller kids rooms, teen rooms and guest rooms. We offer innerspring, latex and memory foam twin XL mattresses at all price points and comfort levels.