Used twice. There is some blackening on the heel. There are no noticeable stains or scratches on the other parts. Please check the product images for the condition. Hygienic because you can put them on without using your hands. The opening is wide and you can slip them on easily. Air sole with excellent shock absorption, reducing the burden on knees and lower back. Excellent cushioning and deodorizing function for a comfortable fit. Lightweight, so you won't get tired easily, and comfortable to wear. Designed to be comfortable even for long hours of work.