What limitation does a firefighter's protective suit have?

A firefighter's protective suit is specifically designed to shield against various heat sources and high temperatures typically encountered during firefighting operations. However, while these suits provide significant protection in fire scenarios, they are not completely resistant to all hazardous materials. Firefighters may encounter substances that can permeate their suits, particularly if the suits are not specifically engineered for chemical resistance. Hence, the limitation lies in their ability to offer adequate protection from hazardous materials, which can pose serious risks and require additional protective gear depending on the situation.

The other options describe scenarios that do not accurately reflect the capabilities of a firefighter's protective suit. For instance, these suits are built to withstand high temperatures associated with fire and are often treated to be waterproof as well. Additionally, they can be used in cold weather, and while they may not be as insulated as specific cold-weather gear, they are designed with layers that provide a degree of thermal regulation.