Thank you for viewing. This item is used and has minor scratches, scuffs, and dirt. Please check the condition in the images. I purchased it in this condition, so I don't know the details, but I believe it's a vintage helmet with a worn look. The black areas in the images are metal mesh air vents, providing excellent ventilation. It's not made of plastic, so it's more durable and has a heavier feel compared to other helmets. It may be for motorcycles. There is no size marking, but the size I use for my motorcycle is approximately 60cm head circumference. Because the opening is small, you'll need to spread the sides to put it on. Since I have a large face, I think most people will be able to wear it. Please note that all sales are final, and returns are not accepted. If you have any questions, please ask.