To use these awesome men's hooded sweatshirts, just slip them on for your daily activities. They're great for casual outings or just lounging at home. When it comes to sizing, remember that the international size we use is 1 size smaller than the US standard. So, it's a good idea to order 1 - 2 sizes bigger than your normal size for a perfect fit. For maintenance, you can throw them in the washing machine. Use cold water and set it to a gentle cycle with mild detergent. After washing, just hang them up to dry. Keep in mind that the color might look a bit different on your monitor than in person. Also, because we measure by hand, there could be a 2cm/1 - inch difference in the size.