Patented "Torsion Flex" technology allows shield to absorb energy from the impacts of objects such as bullets from small arms (22 to 44 caliber), rocks, pellets, small projectiles, etc. Dual layers of 1/2" and 3/8" polycarbonate protective glazing sheets shaped to fit most standard cutoff and sag lens cobraheads. Superior ballistic containment properties with excellent impact absorption.