Birkenstock Sienna Red Suede Boston Corduroy Slide Clogs Shoes Women's Size 9 Please see photos for signs of wear So classic and consistently comfortable, the Boston clog has become a coveted, year-round favorite. This season, embossed suede takes on the style of corduroy for a crafted quality that's as soft as it is durable. A tonal, textile-inspired buckle brings the heritage look together—all grounded in the comfort of our contoured footbed.