Birko-Flor = Faux Leather. Not a leather upper. Don't get me wrong, this is a great sandal from a fantastic shoe maker BUT I had expected the &#34;upper&#34; - meaning the parts of the shoe that go over the foot - to be leather. It is not. The &#34;upper&#34; material is listed on the box as &#34;Birko-Flor&#34; which appears to be fancy, German-shoemaker-speak for faux leather. Feels like vinyl on the outer-facing side; feels like polyester felt or faux wool on the inside that comes into contact with your foot. Very comfortable, but am wondering how the faux leather is going to hold up over time. The footbed-liner - meaning the part of the foot your foot sits on - is actually leather. A final note about the color: &#34;Graceful Toffee&#34; is a glossy, metallic brown. It looks like glossy mid-value brown indoors, but outside, in the sunlight, it looks more metallic, like a warm bronze. Very pretty, but did I mention it's not leather??