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 Strappy Shoes:
Strappy shoes are shoes that are characterized by multiple straps covering the toe and/or heel. The straps on strappy shoes can be used to secure the shoe to the foot or some of them may be more for ornamentation.