Material: ABS with high-quality ultraviolet stabilization. Inside protection: High density polystyrene, protective padding. Chinstrap:4 points textile anchor. Adjustable head band with a toothed wheel. Aeration holes Headband 54cm to 61cm Can be used for work at height EN 12492:2012 Complies with the requirements for impact protection and puncture resistance EN 397:2012+A1:2012