The Nike Run Therma Sphere Hood 2.0 Balaclava was made using super lightweight and soft Nike Therma Sphere fabric that insulates and retains heat to keep you warm, and it was treated with Dri-FIT technology that helps to wick away sweat to keep you dry inside. This stretchy material conforms to your head, and the fold over design allows you to adjust the fit and your face coverage as you warm up or get colder. Plus, it's machine washable for easy cleaning and to keep it smelling fresh. Perfect for your cold weather runs!