Sydney Size:40 Solid black: 40% cotton

Solid black: 40% cotton

1% stretch nylon

Unisex sizing: One size fits women’s shoe size 6 through men’s shoe size 15

You should be able to fit about a pinky finger between your heel and the heel counter because the sole is nonflexible

Sydney Size:40 Solid black: 40% cottonThe Sydney combines form and function with its stylish straps and trademark Birkenstock comfort. Its silky, shiny upper is made of synthetic material rather than leather. Details: Narrow width (B) Synthetic Birko Flor upper Adjustable straps across forefoot and midfoot with functional buckles Suede covered cork and latex footbed EVA outsole for long lasting wear Fit & Feel: Be aware of where your arch hits inside the footbed. This is the best