I purchased these for outdoor running and have used them for about a year. I think I've worn them about 20 times. I haven't worn them much, so I don't see any noticeable dirt or scratches. Size: 28.0 Mizuno's Wave Advance is made of lightweight mesh material, providing excellent breathability and a comfortable running experience. - Brand: Mizuno - Model: Wave Advance - Color: White/Black/Red - Material: Mesh Thank you for looking.