Type I – has the greatest required inherent buoyancy and turns most unconscious persons in the water from a face down position to a vertical and slightly backward position, therefore, greatly increasing one’s chance of survival.
Type II – intended to turn some unconscious persons from a face down position in the water to a position where the wearer’s respiration is not impeded.
Type III – intended to support a conscious person in the water in an upright position. This type of device is not required to turn an unconscious person in the water from a face-down position to a position where the wearer’s respiration is not impeded.
Type V – is approved for restricted uses or activities such as boardsailing, or commercial white water rafting. These devices may not be suitable for other boating activities. The label indicates whether a particular design of Type V can be used in specific application, what restrictions or limitations apply, and its performance type.