Gorgeous, comfortable, and sustainable from the famous Spanish shoemaker. These run about a 1/2 size small. They are a 40 and I am a 9 but a tiny bit too small. A comfortable 8.5. It was too expensive to ship back to Spain, so hope these find a good home here. From website: Description • Black leather slipper combined with black piping. • The outside of the shoe is 100% leather, and the inside of the shoe is 100% organic cotton with anti-bacterial treatment. • The sole is made of rubber produced from recycled bicycle tyres. • Handmade in Spain.