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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.