OSdream MICH 2000 Tactical Helmets - Thickness 6mm MaterialABS. Not Designed to Withstand or Protect Against Real Ammunitionit is not fit for high speed motorcycles to use SizeHead circumference 56-62 cm 22-24.4 inchadjustable chin strap Frosted particles on the surface painting process, reflective rate minimum Webbing system material: 1.5 cm wide Twill polyester padded webbing Weight: about 980 grams