The waterproof leather and 1000D Cordura? upper of the Series 100? Waterproof Side Zip Boot can be pulled snug with the quick and easy NATO speed lace system. A special gusset behind the zipper helps keep water out while the triple-density rubber foundation and an arch made from a durable compound will hold up to the rigors of fast-roping. The Series 100? is a great value in footwear for street patrol/tactical activity duty safety professions and more. Propper? footwear was designed for long-lasting comfort and durability. All of our boots are based on true U.S. sizing to provide the perfect fit.