The four buoyancy classes

The four buoyancy classes according to ISO 12402

		50 N Buoyancy aid (swimming aid) For regular swimmers near a beach or means of assistance, not unconscious. This is not a lifejacket!
		100 N Lifejacket Inland and protected waters. Not suitable for unconscious persons.
		150 N Lifejacket For use in all waters and for unconscious persons unless wearing heavy or waterproof clothing.
		275 N Lifejacket For use in all waters and for for unconscious persons, especially in heavy conditions and when wearing heavy or waterproof clothing.