Which vest type uses circulating cooling water and is powered by a battery?

• A. Air cooled vest
• B. Ice cooled vest
• C. Water cooled vest
• D. Hybrid cooled vest

Answer: (C)

Cooling vests come in several designs to manage heat while you're in protective gear. The vest that uses circulating water through a network of tubes and is powered by a battery-driven pump moves cooled water around your torso. A cooled reservoir or chiller supplies the water, and the pump keeps it circulating so heat is carried away continuously from the body. This setup provides sustained cooling during longer operations because the circulation keeps removing heat as long as there’s power and cold water available.

Other options don’t use circulating water. An air-cooled vest relies on a fan to push ambient air through channels, which cools by evaporation and air flow rather than water. An ice-cooled vest uses ice packs to absorb heat but doesn’t circulate water, so cooling duration is limited as the ice thaws. A hybrid cooled vest combines methods, but the defining feature here is the circulating water driven by a battery-powered pump.