What type of clothing should firefighters avoid wearing while on duty?

Firefighters should avoid wearing non-fire-resistant synthetic clothing while on duty due to the significant hazards it presents. Synthetic materials like polyester or nylon can melt upon exposure to high temperatures, which is a common risk during firefighting operations. When these materials melt, they can adhere to the skin and cause severe burns, complicating injuries that firefighters might already sustain in a fire situation.

In contrast, materials like cotton do not melt, though they can still burn; they are generally considered safer than synthetic options. Heavyweight clothing may provide some protection against elements but does not inherently pose the same risks as non-fire-resistant synthetics. Loose-fitting clothes could also be a concern in specific scenarios due to the potential for snagging or increasing the risk of becoming entangled, but they are not as dangerous as synthetic fabrics that can directly contribute to burn injuries. Therefore, the emphasis is on avoiding non-fire-resistant synthetic clothing, ensuring that firefighters are protected as effectively as possible in dangerous environments.