There are a few things to consider when purchasing a PFD (personal flotation device):
-Your local boating regulations. Some states/countries have specific requirements for what type of PFD must be worn on certain types of boats.
-The activity you'll be using the PFD for. There are different types of PFDs designed for different activities, such as sailing, fishing, kayaking, canoeing, etc.
-Your body size and weight. PFDs come in different sizes and have different weight limits. It's important to choose a PFD that will fit properly and provide adequate flotation for your body size and weight.
-Features. Some PFDs have additional features that may be beneficial for your needs, such as pockets, hoods, rescue whistles, etc.