Using your Wolky Nomad sandals is a breeze. Just adjust the three Velcro straps on the front to get the perfect fit for your feet. Slip them on and enjoy your summer strolls. When it comes to maintenance, use a soft, damp cloth to gently clean the leather parts of the sandals. Avoid using harsh chemicals as they can damage the high - quality leathers. Let the sandals dry naturally in a well - ventilated area. If you notice the memory foam footbed losing its shape over time, simply give it a break by not wearing the sandals for a few days. As for the size, keep in mind that the measurements are based on size 38 and may vary for other sizes, so choose the size that suits you best according to the width guideline (size W for average to fuller feet).