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The fornix is by no means safer than the bug. If the bug fits go for it, it is a multiple impact rated (backcountry only) helmet while the fornix is not. It has two full shells with full aramid protection while the fornix only has aramid bridges. The MIPS system on the bug is in between the two shells and the foam, meaning that the entire foam inner on the helmet moves, while the fornix has the MIPS directly against the head, which seems not as good of design. Most importantly, the fits are very different so buy which one fits you.