NOT suitable for big head!!!!!Please Check the size Instructions in the Picture Carefully to Make Sure the Helmet Fits Your Head Ccircumference. If You Feel a Little Tight, Try Removing the Mmat From the Helmet.
Adjustable: M/L Size: 53-57 cm （21-22.5 inch）; L/XL Size: 58-61 cm （22.5-24 inch）.
Made by High Quality ABS, Weight: about 770g
Not Designed to Withstand or Protect Against Real Ammunition.
Side Rails w/ Goggle Strap Clips & NVG Shroud, Bungee Retention for NVG; Vel-cro Panels Allow Fitment of Patches, IFF, Safety Lights, and Nametapes; Lightweight But Durable, High Quality Construction for Head Protection.