At 1350 gms, Tiivra helmets are both lightweight and high performance, since they are made of composite fiber. Typically the shell and EPS add to the weight of a helmet. Plastic helmets have a thicker, heavier shell and a low density EPS (less than 40 kg/m³) - offering minimum protection. What adds to our weight is a high-density EPS. Higher the density, greater the shock absorption