What is a primary feature of life jackets?

A primary feature of life jackets is that they provide buoyancy to keep a person afloat. This is the essential function of any personal flotation device (PFD). Life jackets are designed to ensure that individuals who find themselves in water can remain on the surface, reducing the risk of drowning. Their buoyancy makes them critical safety gear for anyone engaged in water activities, regardless of the conditions or type of watercraft being used.

The other options do not accurately reflect the primary purpose of life jackets. They are not restricted to certain activities like fishing excursions, nor are they designed exclusively for use in stormy weather. Additionally, life jackets are not categorized by their cost or limited to large vessels; rather, they are widely manufactured in various styles and prices to accommodate different types of water activities and vessels, ensuring safety for all users.