Is it a shoe or a sneaker?

Why is it so hard to find shoes for my girls? I really like to get them leather shoes/sneakers for back to school. They each have one pair of gym sneakers (laced), one pair of casual sneakers (velcro), ballet flats and now am on the search for black mary janes that are comfortable to wear but more like a casual sneaker. Most of them are not leather. I want them to be comfortable and not have sweaty feet. I just have not found the ideal pair yet. Especially this season with all their clothes they chose for back to school are black I would love them to have a simple black pair. If anyone has ideas and/or suggestion I would love to hear them! I am now on zappos.com and there are a ton of kids shoes to choose from, so wish me luck!