Duck Boots are lace up, waterproof boots with a flat, wide rubber vamp. They have gum rubber traction soles and leather uppers extending a few inches above the ankle. Duck Boots are usually lined with an insulated material and are designed for wear in rain, snow, slush and just about any cold or wet weather.
About Shearling:
Sheep or lambskin with attached wool. Generally used as a lining in footwear to provide warmth.