I adore these Melissa flats so much and own the Campana Zig Zag in several colors. My previous Melissa Campana Zig Zag flats broke/tore at the heel and toe areas because they were too small, but I managed to get a good two years out of them! It's unfortunate that they don't come in half sizes because I usually wear a size 7 or 7.5. In these shoes, the 7 is just a smidge too small and the 8 are a smidge too big (but sizing is as I would expect). Since the plastic is smooth and does not "grip" to the foot, the bigger size somewhat flops around at the heel when walking. I opted for the smaller size so they would stay on easier.
I bought these to replace my old pair that broke and the one thing I would like to point out about these particular black Melissa flats were they happened to be a colorful sparkle (with hints of blue, green, and red) instead of a "flat black" sparkle like an old pair I have. In the photo I uploaded, you will see the comparison of the flat black sparkle (left) vs. colorful black sparkle (right). The colorful sparkle certainly is gorgeous and is fairly subtle, but since I wear these to work, they seemed a little too unprofessional with the colorful sparkle. I ended up returning them and searched high and low for the flat black sparkle.