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 T Strap Sandals:
T strap sandals are sandals characterized by a "T" formation by the straps on the top of the sandals. T strap sandals include a strap which crosses the top of the toes horizontally, while another strap cuts through the middle of the foot vertically.