What should always be worn while on a boat?

Wearing a life jacket while on a boat is essential for safety. Life jackets are specifically designed to keep a person afloat in the water and significantly increase the chances of survival in case of an accident, such as falling overboard or capsizing. They provide buoyancy and help prevent drowning, which is a leading cause of death in boating accidents.

The other options, while they may serve specific purposes, do not offer the same level of overall safety that a life jacket does. Water shoes provide grip and protection for the feet but do not aid in flotation. A diving mask is used for underwater visibility but will not contribute to safety if someone falls into the water. A protective helmet may protect the head in situations such as riding personal watercraft or during impact, but it does not assist with floating or swimming. Thus, ensuring that a life jacket is worn is a fundamental safety practice mandated by boating regulations.