Winter Boots are boots which are sturdy in nature, and meant for protection from winter elements. Winter Boots are commonly waterproof or water resistant so feet stay dry in the winter months.
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.