"Ⅲ" type arc top, increase the ability to resist the impact of the positive top, one finger key button, adjustable cap liner, suitable for petroleum, chemical industry, municipal construction, construction, electric power, nuclear construction, wind energy, and any other industries that have the danger of impact on the head.

"Ⅲ" type arc top, increase the ability to resist the impact of the positive top, one finger key button, adjustable cap liner, suitable for petroleum, chemical industry, municipal construction, construction, electric power, nuclear construction, wind energy, and any other industries that have the danger of impact on the head.