Which of the following is a recommended measure to prevent hypothermia?

• A. External insulation
• B. Sleep naked in cold
• C. Expose skin to cold to acclimate
• D. Drink alcohol to stay warm

Answer: (A)

Preventing hypothermia comes down to minimizing heat loss from the body. External insulation does this most effectively by creating a barrier between the skin and the cold environment, trapping still air that acts as a poor conductor of heat. This slows how quickly your core temperature drops, which is the key to staying safe in cold conditions.

Other options actually increase risk. Sleeping naked in cold environments increases heat loss rather than reducing it. Exposing skin to cold to “acclimate” isn’t a reliable or safe protection and can lead to cold injuries. Drinking alcohol may make you feel warm temporarily, but it causes blood vessels to dilate and accelerates heat loss, plus it impairs judgment and coordination in cold water or environments.

In practical terms, use proper insulation—layers and dry, well-fitting protection like a drysuit or insulated wetsuit when diving—to keep heat in and stay safe.