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.
About Zipper:
A zipper, sometimes called a 'slide fastener' is a device consisting of two toothed tracks or spiral metal or plastic coils, each bordering one of two edges to be joined, and a piece that either interlocks or separates them when pulled.