The powered respirators can be very comfortable. They don't need a tight seal against the skin, so they don't have that to cause injury. The forced air leaks ou

The powered respirators can be very comfortable. They don't need a tight seal against the skin, so they don't have that to cause injury. The forced air leaks out around a loose seal, preventing contamination. The most comfortable design is probably a full head covering, with a loose stretchy collar fitted around the person's neck. That could even be porous fabric. An excellent design would use a semi-rigid clear plastic helmet (like the plastic of a 2-liter soda bottle) with a Spandex neck collar. Another design is just a clear plastic bag.