What is the primary design purpose of a Type II personal flotation device?

The primary design purpose of a Type II personal flotation device (PFD) is indeed for inland use. These devices are crafted to provide buoyancy and support in calm, inland waters, making them suitable for activities such as boating or fishing on lakes and rivers. Type II PFDs are designed to provide basic flotation to keep a person's head above water if they are unexpectedly plunged into the water, which is particularly important in these settings.

Additionally, while Type II PFDs offer more stability than a Type I PFD, they are not specifically intended for rough waters, which would require a different type of flotation device designed to enhance safety in challenging maritime conditions. They also differ from throwable devices, which are not designed for wear, but rather for rescue situations where a person in trouble can grab onto the device without needing to wear it.