I used these indoors with socks. I haven't worn them outside. They are 13 cm and make a sound when walking. My child has outgrown them, but they are still in good condition, so I'd like to give them to someone who needs them. I bought them at Aeon. Navy car-design baby sandals, comfortable to wear. - Brand: BRIGHT DAYS - Color: Navy - Design: Car design - Type: Sandals Thank you for looking. Children's sandals, baby sandals, children's shoes, baby shoes