Just prefacing these are not authentic, they are FAKE. Bought this as a size 10 myself and they’re big so I’m trying to sell for break even, I’m not here to make a profit. The original retails $170 for comparison. The upper strap is made of a soft suede material, and an adjustable buckle for a tighter or looser wear. Additionally, the bed is made of cork which molds to your feet in the long run providing a custom fit.