The Protos Integral arborist helmet from Pfanner is simply the most advanced helmet system available today. The Protos helmet integrates eye, ear and head protection into one modular helmet system. This Type 1, Class C helmet has a patented design that not only protects from vertical impacts, but also side and rear impacts, The special cushioning construction of the interior shell effectively absorbs impacts, greatly reducing the energy transfer to the head and spine. The Protos Arborist helmet comes complete with a chin strap.