【Helmet For Small Head Adults and Teenagers】Only suitable for people with head circumference under 24 inches！Not For Big Heads! 【Guide Rail & Multifunctional Device Base】 : The two side rails and the front NVG mount can fix most airsoft accessories like night vision device,flashlight,communications headsets etc. provides excellent experience in gameplay. 【Airsoft Mask】: Airsoft mask built-in sponge and elastic headband fit most size of head. 【Detachable Airsoft Goggles】180°broad view clear lenses, detachable goggles fit your other helemet and mask. Best to wear extra goggles under it.