Final answer:
A Type III life jacket is a buoyancy aid that is designed for use in calm waters where rescue is expected to be quick. It provides comfort and mobility, making it suitable for water sports and boating.
Step-by-step explanation:
A Type III life jacket is a buoyancy aid that is designed to be used in calm waters where a rescue is expected to be quick. It is considered a flotation aid rather than a life-saving device, unlike Type I and Type II life jackets. Type III life jackets provide a greater degree of comfort and mobility compared to the other types, making them suitable for activities such as water sports and boating.