Currently, there a number of methods by which nanomaterials are being implemented into body armor production. The first is based on nanoparticles within the suit that become rigid enough to protect the wearer as soon as a kinetic energy threshold is surpassed. These coatings have been described as shear thickening fluids. These nano-infused fabrics have been licensed by BAE systems however as of mid 2008, no products have been released based on this technology. In 2005 an American company, ApNano, developed a material that was always rigid. It was announced that this nanocomposite based on Tungsten Disulfide was able to withstand shocks generated by a steel projectile traveling at velocities of up to 1.5 km/s. The material was also reportedly able to withstand shock pressures generated by the impacts of up to 250 tons per square centimeter. During the tests, the material proved to be so strong that after the impact the samples remained essentially unmarred. Additionally, a recent study in France tested the material under isostatic pressure and found it to be stable up to at least 350 tons/cm². As of mid-2008, spider silk bulletproof vests and nano-based armors are being developed for potential market release. Both the British and American militaries have expressed interest in a carbon fiber woven from carbon nanotubes that was developed at Cambridge University and has the potential to be used as body armor.In 2008, large format carbon nanotube sheets began being produced at Nanocomp. These long tube materials may find their way into advanced ballistic armor.