A back zipper is a slide fastener located at the rear of a garment or shoe. In footwear, a back zipper closure is mostly used in high top boots for women and is intended for esthetic purpose rather than functional.
About Casual Shoes:
The broadest range of footwear, which includes loafers, sandals, sneakers, and boots. Casual shoes are designed for everyday use and comfort and are usually made of durable materials.
About Flat Heel:
Flat heel are shoes with a very low heel, and in some cases no heel at all, that provide minimal elevation. Flat heel shoes come in a variety of styles, including sandals, loafers, moccasins, oxfords, deck shoes, ballerina flats and boots. Flat heel shoes are generally considered comfortable footwear, mostly due to their flexible, lightweight soles and low heels, which provide stability.