Features: 
-Helmet internal foam, good ventilation, Hard Shell .
-Simple fitment and easy removal , adjustable internal padding.
Velcro Panels on right, left, and backside of helmet for Patches or covers.
-Side Rails fit a variety of accessories, Integrated NVG mount compatible with most GoPro NVG style mounts ,allows you to install GoPro when playing games (NVG mount not included).
-Durable carbon construction.
-Vent holes for increased ventilation and water drainage.
Head circumference: 54-65cm