Material:ABS Dimension: Height 15cm×Wide 32cm×Thickness 3.5mm Head Circumference: 58-60cm With replaceable buckle and removable foam pad Description: 1)The night vision device directly fused to the helmet,you can directly install other devices such ascamera/headlamps in the head of the helmet. 2)The interior is equipped with lightweight, impact,breathable EPP cushion. 3)Both sides and back with the hook&loop ,you can attach IR identification chapter, morale chapter,and other combat accessories. 4)Equipped with FAST-ARCs that can connect head cameras ,goggles,communication equipment, and masks. 5)Turn the button to adjust the lightness for helmet to fit your head.