No, not all Cat6 cables are not waterproof. In fact, most Cat6 cables are not waterproof, and most cables will not hold up in a wet environment. Cat6 is typically made with a variety of materials, including plastics, metals, and rubbers. While some of these materials are more water-resistant than others, none of them are waterproof. This means that if you are looking for a cable that can be used in a wet environment, you need to find a Cat6 cable that is specifically designed for that purpose.