OneTigris MICH 2000 Style ACH Tactical Helmet with NVG Mount and Side Rail Accessory rail connectors provide attachment points for quick attach or release, such as flashlights,camera ,visor...etc. 7 pieces of self adjustable sponge padding inside, make your wearing more comfortable Loop panels around, provide extra place to unique your helmet with patch attachment Adjustable suspender straps and chin/neck pad for best fitting Head circumference 56-61cm/22-24 inch; Weight: about 665g