The Stream-line Inflatable Life Vest was designed for offshore and inshore. It has a more streamline and light than the traditional inflatable life vest. It will automatically/manually inflate when submerged in water, but not prematurely due to rain, spray or humidity. Each Vest is available with a stainless-steel adjuster. Use only Leon's re-arm kits. Use of other re-arm kits may result in improper operation or failure to operate and will void the product's warranty.