Mustang Survival's Deluxe HT new series of high-performance Inflatable personal flotation devices (PFD) feature an auto hydrostatic inflator that gives users reliability and comfort in intense, high-risk weather conditions. The PFD's inflation device is triggered by hydrostatic pressure when submerged 4 inches below the water surface, and is not sensitive to rain, water spray or humidity, thus eliminating the potential for inadvertent inflation. The vests are outfitted with a Hammar Type 1F auto hydrostatic inflator with manual backup and a safety inspection window for easy viewing of inflator status and replacement date. The lightweight and compact designs also feature Mustang Survival's patented SecureZip, which is a bi-directional zipper providing secure closure that withstands rigorous activity and is easy to pack.