Using these Castelli Entrata Black Shoe Covers is a breeze. Just stretch them open and pull them over your shoes. They're designed to fit well thanks to the 4 - way stretch. On cold days, they'll keep your feet toasty. When it's windy or splashing, the neoprene cuff and the overall design protect your feet. For maintenance, just hand - wash them in cool water with mild soap and let them air dry. Don't put them in the dryer. Also, make sure to check for any signs of wear and tear regularly. If there are small holes, you might be able to patch them up to extend their life.