What is regarded as a disadvantage of using lightweight materials in SAR gear?

Using lightweight materials in SAR gear is often associated with less durability. This is because many lightweight materials, while easy to carry and suitable for reducing the burden on responders, can sacrifice strength and resistance to wear and tear. Durability is crucial in search and rescue operations where gear must endure harsh environments, exposure to elements, and rigorous use. If the materials cannot withstand these conditions, the gear may fail at critical moments, potentially compromising the safety and effectiveness of the rescue operation.

The other choices may have their merits, but they do not align as directly with the common disadvantages observed in lightweight materials used in the context of SAR operations. For instance, while lightweight materials can sometimes be more costly, this is not a universal truth and often depends on the specific material and manufacturing process. Additionally, lightweight gear is typically designed with a focus on minimizing bulk, contradicting the notion of "greater bulk." Lastly, insulation properties are generally engineered to be effective, and while some lightweight materials may offer different insulation capabilities, this aspect can vary widely based on the specific design and purpose of the gear.