The helmet is made of Spectra fibre. It is not bulletproof. It is a fragmentation-resistant helmet and has a maximum distortion (loss of shape) of 20 mm from a 9mm FMJ (Full Metal Jacket) bullet of 8 g (124 gr) travelling between 390 and 420 m/s on impact. It has a resistance to fragments in accordance with NATO Standardised Regulation ("STANAG") 2920, V50 mini, which is 640 m/s. Resistance to shock-impact in accordance with the EN397 standard, which is a protection standard for industrial helmets.