Bostonian | Shoes | Bostonian Classics Mens Size 15 D Dress 。The Bostonian Metro Flex is a classic slip-on dress shoe designed for the modern gentleman who prioritizes both style and all-day comfort. Known for its sophisticated silhouette, it blends formal aesthetics with the flexible feel of a casual shoe.Key Features and ConstructionPremium Materials: Most models feature high-quality leather uppers and lining, often with premium Italian leather in higher-end versions.Metro Flex Technology: This product line is specifically engineered for flexibility. Many versions utilize a leather insole and outsole for a traditional look, while others may feature a lightweight rubber or EVA sole for increased shock absorption and reduced fatigue