Characteristics:This product complies with relevant requirements of 1996 Amendment to the International Convention for the Safety of Life at Sea,1974 and the International Life-saving Appliance Code.It is accredited by CCS certificate issued by China Classification Society. Main specification:1)Thermal performance: The wearer's body core temerature does not fall more than 20°C after a period of 6 hours immersion in calm circulating water at a temperature of between 0°C~20°C; 2)Bouyancy: More than 142N and the decrease of buoyancy is less than 5% after submerging in fresh water for 24hours;3)Floating performance: The wearer is capable of floating in face-up and lifting the wearer's mouth above the water surface at least 120mm.