Which of the following is essential in the selection of protective clothing?

Layering is essential in the selection of protective clothing because it allows for the adjustment of insulation and moisture management according to varying environmental conditions and the activity level of the worker. Proper layering can enhance comfort, regulate body temperature, and ensure that the clothing system provides effective protection against thermal hazards and electrical arcs.

In addition to providing thermal protection, layering can also help minimize the risk of heat stress, as workers can add or remove layers to adapt to changes in temperature or exertion levels. This adaptability is crucial in maintaining safety standards as it enables workers to remain both protected and comfortable while performing their duties.

Cost, style, and manufacturer, while important factors in the overall selection process, do not address the fundamental need for effective hazard protection that layering provides. Therefore, focusing on layering when selecting protective clothing aligns with the best practices outlined in NFPA 70E guidelines.