USCG approved. The Hydrostatic Inflator Technology offers reliable inflation in a low maintenance design that will only automatically inflate when submerged in 4 or more inches of water and not inadvertently due to rain, spray or humidity. Exclusive to Mustang Survival in North America and maintenance-free for 5 years or until inflated. Made for the most severe marine environments the Deluxe Inflatable PFD with HIT will meet the challenges of the most demanding users. It also features the patented SecureZip TM closure system to ensure the PFD will stay closed during even the most rigorous activity and still opens effortlessly upon inflation.