The Protos F39 'Climb Everything' Visor is unique to New Zealand and only available from Treetools. If you know your tree climbing history, you will want one of these custom F39 Protos Visors. Zane Wedding designed the image in 2009 to capture the essence of SRT climbing workshops of the day. The Protos F39 (39 openings per square centimetre) is the most common replacement mesh visor for the Protos Arborist Helmet. The Protos etch metal visor fits the helmet precisely, with no protruding parts or cavities in which branches and debris can get caught. In addition, the special coating on the metal mesh reflects sunlight and prevents the visor mesh from freezing in temperatures below zero.