metal or ceramic plates in their bullet resistant vests, providing additional protection from pistol and rifle bullets. Metallic components or tightly woven fiber layers can give soft armor resistance to stab and slash attacks from knives and bayonets. Chain mail armored gloves continue to be used by butchers and abattoir workers to prevent cuts and wounds while cutting up carcasses. Ceramic Boron carbide is used in hard plate armor capable of defeating rifle and armor piercing ammunition. It was used in armor plates like the SAPI series, and today in most civilian accessible body armors. Other materials include boron suboxide, alumina, and silicon carbide, which are used for varying reasons from protecting from tungsten carbide penetrators, to improved weight to area ratios. Ceramic body armor is made up of a hard and rigid ceramic strike face bonded to a ductile fiber composite backing layer. The projectile is shattered, turned, or eroded as it impacts the ceramic strike face, and much of its kinetic energy is consumed as it interacts with the ceramic layer; the fiber composite backing layer absorbs residual kinetic energy and catches bullet and ceramic debris. This allows such armor to defeat armor-piercing 5.56×45mm, 7.62×51mm, and 7.62x39mm bullets, among others, with little or no felt blunt trauma. High-end ceramic armor plates typically utilize ultra-high-molecular-weight polyethylene fiber composite backing layers, whereas budget plates will utilize aramid or fiberglass. Fibers DuPont Kevlar is well known as a component of some bullet resistant vests and bullet resistant face masks. The PASGT helmet and vest used by United States military forces since the early 1980s both have Kevlar as a key component, as do their replacements. Civilian applications include Kevlar reinforced clothing for motorcycle riders to protect against abrasion injuries. Kevlar in non-woven long strand form is used inside an outer protective cover to form chaps that loggers use while operating a chainsaw. If the moving chain contacts and tears through the outer cover, the long fibers of Kevlar tangle, clog, and stop the chain from moving as they get drawn into the workings of the drive mechanism of the saw. Kevlar is used also in emergency services protection gear if it involves high heat, e.g.'', tackling a fire, and Kevlar such as vests for police officers, security, and SWAT. The latest Kevlar material that DuPont has developed is Kevlar XP. In comparison with "normal" Kevlar, Kevlar XP is more lightweight and