Complete with ISO 12401 approved safety belt. The HAMMAR MA1 hydrostatic automatic inflation system prevents the life jacket from inflating by mistake. This can happen with classic inflation systems that activate with water. The HAMMAR system activates only with hydrostatic pressure (submersion of at least 15 cm underwater). Adult model with safety thigh strap. Coupled with the automatic signal light 22.409.23, it becomes mandatory as onboard equipment beyond 6 nautical miles from the coast.