The Merinos Flat was designed to be the perfect marriage of style and comfort. Removable insoles, built-in removable arch support, and machine washable. To wash, start by wiping down the shoes with a towel to get rid of any loose dirt. Next, remove the insoles from your shoes - you should wash these by hand in the sink for the best results. On the delicate/wool cycle (cold water) put your shoes in the washing machine. We suggest using a linen bag to protect the shoes. Air dry ONLY - do NOT tumble dry as this can ruin the shoes. Finally, reinsert the insoles and continue to enjoy your Merinos! Women's Flats are available in sizes 5.5 – 12. Our flats are designed to be true to size; if you are typically between half sizes, we recommend ordering a half size down. For example, if you're not sure if you're a 6.5 or 7, we recommend going with the 6.5.