What feature do vests with phase-changing technology provide?

Vests equipped with phase-changing technology are specifically designed to regulate temperature by absorbing, storing, and releasing heat. The cooling formulation of these vests is effective at maintaining a comfortable temperature range, typically around 59-65 degrees Fahrenheit, for a duration of 2-3 hours. This feature is particularly beneficial in high-temperature work environments, as it enhances comfort and reduces the risk of heat-related illnesses, allowing the wearer to maintain focus and performance during tasks.

The other options, while discussing features important for protective apparel, do not accurately represent the primary function of vests with phase-changing technology. Insulation from extreme temperatures is a characteristic of different materials designed for thermal protection, rather than temperature control. Fire resistance is a critical property for apparel used in hazardous environments, but does not relate to phase-changing technology. Lastly, while a lightweight design may be an advantageous trait for ease of movement, it is not a defining feature of phase-changing vests.