ATAIRSOFT Breathable Tactical Airsoft Fast PJ Helmet w/ Sliding Goggles OD Green NOT suitable for big head!!!!! For Hat Size: 59 or below  ( Internal width: 6.69" (17cm); Internal length: 8.66" (22cm) ). Weight: 550g ***Please check the image on the left side Internal width: 17cm / length: 22cm Include sliding goggles / Adjustable headband. Weight: 700g Side Rails fit a variety of accessories, Integrated NVG mount compatible with most GoPro NVG style mounts (NVG mount not included)