Lateral Euroslot sockets for earmuffs 3 adjustable vents provide airflow and help regulate the temperature inside the helmet for even more comfortable wear. Adapter systems for uvex face shields, earmuffs and lights that can be attached to the helmet. Adjustable headband size with ratchet wheel allows for custom adjustment. Certified to EN 397 with the following extra requirements: -30 C for protection at extremely low temperatures MM=melted metal(splash). adjustable size range.