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The mattress size of choice for American college dorm rooms, twin extra-long mattresses measure 39" wide by 80" long, five inches longer than a regular twin and the same length as a king. In fact, two twin extra-long beds side by side can make a king bed. A twin extra-long foam bed is also perfect for growing kids or single adults living in small apartments. Check out our selection of twin extra-long foam mattress options to find the right fit for you.