When looking for comforters for your bed you may go for a wool blanket for winter or a thermal blanket for spring, summer and fall use based on the warm and cool nights. Thermal blankets/comforters are comfy in warm weather where as the wool comforters are extremely warm and light weight. If you are going to live in a dorm room you should take notice to heaters in the room. Some dorm residence halls do not have great heating or insulation. Getting a quality warm comforter to fit your twin XL bed is one way of rectifying this issue.