Birkenstock's black nubuck oiled leather Arizona two strap design sandal. Modeled on the cork original with cork upper. Wear them with or with out socks. 

Regular / Wide fit
Adjustable two straps with pin buckle

Made in Germany

Anatomically shaped cork-latex footbed, Flat heel shape
Upper:  nubuck oiled flexible leather with light surface nap
Lightweight EVA sole for cushioning and shock absorption
Footbed lining: cork
Avoid extreme heat

Size 41 = USA Men's 8 - 8.5 / Women's 10 - 10.5
Size 42 = USA Men's 9 - 9.5 / Women's 11 - 11.5
Size 43 = USA Men's 10 - 10.5 / Women's 12 - 12.5
Size 44 = USA Men's 11 - 11.5 / Women's 13 - 13.5
Size 45 = USA Men's 12 - 12.5 / Women's 14 - 14.5
Size 46 = USA Men's 13 - 13.5 / Women's 15 - 15.5