PLASTICANA French Hemp Plastic Opana Mule Manufactured in France from hemp plastic. Sustainable and classic. Slip on and off form that is ideal for wearing around the house or on the go! Unisex, waterproof and 100% recyclable. European sizes. Sizes is EU Women's. This style runs a little large. (I wear a 9.5 and they are a little large for me, however because its a slip on it's quite forgiving) Size 41 = US Women's 10.5/11, Men's US size 9/9.5