I've always believed that the back protector is a crusial part of the ATGAT and rider protection despite not having one. I started to do a bit of a research to choose one for myself. There seem to be a fair bit of controversy about it. To start with, the study (I can find the link, I hope but not now) shows that the current level 2 certified protectors won't have much of an affect because the "safe" force that gets through it should be less than 4kj while existing ones pass on average less than 9kj. The only (at least from what I could find) back protector that reaches the 4 mark is forcefield subfour (named for the obvious reason). Then I read this on the very first source of truth, Wikipedia: So is the myth of a back protector busted or not?