Vessels less than 16 feet. Life Jackets (PFDs). One Type I, II, III, IV, or Hybrid Type V for each person. Hybrid Type V must be worn at all times to meet Coast Guard Regulations. Vessels under 26 feet Life Jackets (PFDs). One Type I, II, III, or Hybrid Type V for each person on board or being towed on water skis, etc., plus 1 type IV available to be thrown. Hybrid Type V must be worn at all times to meet Coast Guard regulations.