Upper Material: Birkibuc - a synthetic material made of acrylic and polyamide felt fibers that is comfortable and tear-resistant

Elastic goring is there to provide a comfortable fit

Great for everyday use

insulating and flexible neoprene for ease of movement

Circumference: 9 "

BIRKENSTOCK BOSTON SUEDE LEATHER WOMEN CLOGS Size:42 (US Men 9 / Women 11) Upper Material: Birkibuc - a"So classic and consistently comfortable, the Boston clog has become a coveted, year round favorite. Soft suede lends an effortless feel to the style. Complete with an original BIRKENSTOCK footbed that shapes to you for the ultimate in all day support. Contoured cork latex footbed creates custom support with wear Classic suede upper Suede footbed lining helps keep you comfortable EVA sole is flexible and lightweight Adjustable strap with metal pin