What is the main advantage of a type iv pfd?

A type IV PFD, also known as a throwable device, has the main advantage of being easy to access and simple to use in emergency situations. It can be easily thrown to a person in distress, allowing them to hold onto it and stay afloat until assistance arrives. Additionally, it does not need to be worn at all times like other types of PFDs, which can be uncomfortable or restrictive. Type IV PFDs are also often cheaper than other types and can be a good option for boats where storage space is limited.