Conforms to EN 352-3 H=32 M=25 L=15 SNR 27 Visor Conforms to EN 166 ABT. G500V5FH510-EU - Supplied with with 5F-1 visor and Optime I ear muffs. Full adjustability, ?up/down? in 3 positions. Adjustable ratchet harness ergonomically designed with eight adjustable positioning. Optimal functionality can be used in combination with P3E ear muff attachments. Also can be used with communication earmuffs, with cable channel for storage. Ventilation channels in the frontal lobe area for improved cooling efficiency. Can be used in conjunction with 3M integrated eyewear thus providing double protection.