Full protection is a large metal cage supported by a wheel at each of its four corners.
Anything less than that is not "All" the protection you can possibly use and you are unnecessarily taking risks with your safety.
From there on it's just a matter of degree.
'77 Harley Ironhead 6,000 miles across Oz
Reryder (AKA Hopper)
1977 Harley Sportster
01 HONDA VFR800
Ancient Harley 45, Snortster (Sporty engine in a Norton), Norton Atlas, Honda 350/4, Ariel HS scrambler