From Openwaterpedia

Arken is an inflatable lifebelt you carry around in swim trunks. The most comfortable inflatable water safety device yet, it provides 75N buoyancy that is enough to keep a 120 kg (265 lb) person afloat. It uses a 16-gram CO2 cartridge filled with compressed air. The lifebelt activates when the wearer pulls the cord on the side of the trunks, and the lifebelt itself inflates in about a second.



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