Yes, many folding knives come with a protective cover for the blade. These covers are often referred to as blade guards or sheaths. Blade guards are designed to protect the blade when the knife is not in use, preventing accidental cuts or damage. They can be made of various materials such as plastic, leather, or nylon. Some folding knives have built-in mechanisms that allow the blade to be safely stored within the handle when not in use, eliminating the need for a separate cover. It is important to keep the blade covered or stored safely when not in use to prevent any accidents or injuries.