Grinnell College | If there is one thing you need to get right in college, it's your dorm mattress. The one's supplied are more than often glorified cardboard. Your bed is the centerpiece of your dorm room and you will spend more time there then at your desk. Make sure your dorm mattress is as comfortable as can be! With dorm room mattresses that range in size and thickness, you are sure to find a mattress that is perfect for you. Look no futher than OCM for all of your twin xl dorm mattress needs so you can sleep well from move-in day through graduation.