ATAIRSOFT PJ Type Tactical Multifunctional Fast Helmet with Visor Goggles Version DE + 1 x Multifunction Card NOT suitable for big head!!!!! Hat size: 59  The size chart on 4th image and middle of page! Not only for tactical activities, it also can be used for cycling. ***Adjustable headband Weight: 600g ( Internal width: 6.69" (17cm); Internal length: 8.66" (22cm) ). Include sliding goggles / With 1 x Multi-function Card. Side Rails fit a variety of accessories, Integrated NVG mount compatible with most GoPro NVG style mounts (NVG mount not included)