Protos Integral Arborist meets the EN12492 mountaineering standard which is recommended to be worn by operatives working at height.  It offers the same features and protection as the Protos Integral Forest helmet, but with the added protection of the advanced technology material, Koroyd, inserted in the crown of the helmet.  Koroyd provides incredible strength to Protos, making it the safest helmet available for use by climbers.  Protos Integral Arborist also features the addition of a chin strap.