Mustang Survival Corp Inflatable Work Vest with HIT (Auto Hydrostatic) with Back Flap and Solas Reflective Tape, Orange USCG Type V inflatable Work Vest Approved for use on inspected and uninspected vessels of any size 1F auto Hydrostatic Inflator Technology will automatically inflate under water pressure, not inadvertently in rain, spray or humidity SecureZipTM closure stays shut in high winds and still opens easily on inflation Provides 35 lb. of buoyancy when inflated - more than twice standard foam PFDs