Using these Wolky Medusa sandals is a breeze. Just adjust the three velcro - closed straps on the forefoot, instep, and ankle to get a perfect fit for your feet. Since they run small, remember to order one size bigger, especially if you have medium to fuller feet. When it comes to maintenance, clean the leather uppers regularly with a soft, damp cloth. Let them dry naturally away from direct heat. If you use custom orthotics, take them out occasionally to air them and the footbed. Also, be careful not to expose the sandals to excessive moisture for a long time, as it may damage the leather. With proper care, these sandals will last you a long time and keep you comfortable with every step.