Please check my profile before purchasing. I received these from another site and wore them once. The strap is made of rubber. There are no noticeable stains, but the fabric feels slightly sun-faded overall. I want to sell these at a low price, so I will flatten the heels for shipping via post. If you are concerned about any potential shape distortion, please refrain from purchasing. (Shipping in a box will cost an additional 350 yen)