Pull on boots are any styling of boot where the wearer puts on the boot by simply pulling the boot over the foot. Pull on boots may have buckles or lacing as long as their purpose is for decoration only.
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.
