What is a disadvantage of a Type IV Throwable Device Personal Flotation Device?

A disadvantage of a Type IV Throwable Device Personal Flotation Device (PFD) is that it requires the user to be within close proximity to the device to be effective, as it is designed to be thrown to someone in distress rather than worn. This can limit its effectiveness in situations where quick access is not possible, or if the person in need is too far away. Additionally, it may not provide the same level of buoyancy and support as wearable PFDs, which are crucial for keeping an unconscious or incapacitated person afloat.