A boot including a bow-shaped structure is disclosed to prevent water entry from the mouth of the boot. The boot generally includes a sole, an upper portion attached to the sole, a foot portion, a leg portion, and a bow-shaped structure on the front and sides of the leg portion. The edge of the bow-shaped structure tapers up towards the front of the leg portion. The bow part of the bow-shaped structure preferably project outwards 1.75 inches from the surface of the leg portion. While walking in deep water, the bow-shaped structure breaks the upward movement of the water and pushes it back down. The bow-shaped structure is molded onto the boot during the manufacturing of the boot. In a preferred embodiment of the present invention, a bow-shaped structure that can be attached to leg portion of a boot is provided.