Smooth & rounded case. Can get really loud. I have bought different colours the material is very light on the skin & comfortable to wear all day or night. Less time at high volume. ) They did not change the shape. Will be sure to order these in different colors. They came this way and look like they are about to rip. I didn?t use all of the square pieces, so I design my own because that could have more big space for my boots or handbags. For the asking price, I say its well worth it. This sandal fits my wide foot just fine and the adjustable strap fits over my very high arch.