Harnesses with foam protectors offer the best protection and are therefore the best choice for all pilots who value maximum security. According to the Papillon training standards, Papillon flight training takes place exclusively with modern foam protected harnesses.
Harnesses with a combination of foam - and airbag protection reach their maximum protection only when the air bag is completely filled.
Especially in the initial phase of the start maximum protection would be desirable, however, harnesses with airbag protection offer effective protection only when the bag is filled. The weight saving, therefore, is at the expense of safety.
Harnesses without protector offer virtually no protection on hard landings or crashes. Pilots must be aware of this risk when using such a harness, for example, in the alpine sports.