A boot knife, also known as a combat knife or fighting knife, is a fixed-blade knife designed for close-quarters combat or self-defense.
Boot knives are typically double-edged and have a blade length of 4 to 6 inches. They are often made from high-carbon steel or stainless steel and have a variety of blade shapes, including drop-point, clip-point, and tanto. Boot knives are typically carried in a sheath attached to the ankle or calf, making them easy to access in a self-defense situation.