Find your proper size by reading the chest-size range on the PFD's inside label. Make sure it's U.S. Coast Guard approved for your size, weight and type of activity. If you do different types of boating, you should get the right PFD for each. Personal flotation devices are classified by location of use. Choose the right PFD for the location and type of boating you plan to do: -Type I is for offshore operations, -Type II is for boating near shore, -Type III is a buoyancy aide to be used where rescue situations may be imminent, -Type IV is to be thrown to an individual needing immediate assistance, -Type V is a specialty PFD for specific activities or consumers.