Grounding sandals with a 100% lead free copper rivet. Sole is made of leather, insole is made of leather, and a leather upper as well. Rubber heel to help with slippery surfaces. Comes with an adjustable ankle strap, 100% cotton stitching. Everything touching your skin is a natural nontoxic material. Please see photos for measurements. I am a size 8 in most womens shoes, these are a size 10. They are worn in from me wearing them maybe 5 times over the past year. So not well worn in, but a bit of wear nonetheless.