these heavy duty shoes feature a sturdy leather upper material making them durable for everyday wear. The 8 US shoe size fits snuggly with a "loafer" design. the actual size is an 8 but due to the inside design and snug fit they are listed as a 7. the outer material is a thick kind of nylon. easily cleaned off. this shoe has adjustable upper Velcro tabs to make them tighter if needed. they feature the famous Kalso Negative Heel technology for great comfort and posture. non smoking home