Rothy's Black Size 11.5 The Flat, like new The wardrobe staple that does it all. Endlessly versatile, washable and comfortable, our classic flat in black is made to last seasons. Plus, it’s knit from plastic bottles. Soft, flexible upper in black—which means no break-in period, ever.  Soft, flexible upper in black—which means no break-in period, ever. Comfortable insoles and durable outsoles in black. Fully machine washable, so they’re like new again and again. Our shoes don’t stretch much—so make sure they are not too snug.