i copied this from USMC0311 jeff guy over at another board thought it would be usefull for you.
U.S. Armor.....Never used Zylon and their Eagle Enforcer vest has had some of the best results in testing (made of Kevlar 129)
Here is some info supplied to me by another LEO in the know:
Here are the rules for armor:
Spectra and other laminates (anything that has the word Flex in it) is a UHMWPE (ultra-high molecular-weight polyethylene. Much the same as found in coffee can lids and trash bags, but a different UHMW molecular structure imparting greater tensile strength at low temperatures, but about the same melting point.
After 180 F, the Spectra becomes damaged and loses strength, at 300f it is worthless snot. It does not recover when it cools.
The 127 +P+ bullets can impart enough energy to actually fuze the material on the periphery of the entry. Muzzle blast from contact hits is also very very bad for Spectra.
Zylon is a PBO fiber that breaks down with exposure to visible light, heat and water vapor(a sweaty cop...ya think)
The ONLY safe armor fabrics are Kevlar (in all it's iterations...Kevlar 129, Kevlar Protera, etc) and Twaron. NOTHING ELSE.
The most reputable company is U.S. Armor...bar none. They are the first company to refuse to make zylon armor way back when nobody else was listening to us. Los Angeles(CA) Sheriff's Department is a major customer (hint, hint)
There are three basic categories:
1. p-aramid (Kevlar, Kevlar Protera(a softer weave), and Twaron) This is the good stuff, the only bullet resistant fabric to be trusted.
2. UHMWPE (Spectra, Dyneema, and various "laminates") These are high-tech coffee can lids. Store them in a hot trunk, or spill a scalding cup of coffee (or leave them lying on the back of a vehicle in sandbox sun) and they are toast. They do not recover after they cool down; zip, zero nada. NOT to be used.
3. PBO (Zylon) Loses strength over time, upon exposure to visible light, ot exposure to heat and humidity. NOT to be used.
U.S. Armor produces Mil type garments in all aramid...check their website. If it is not exactly what you want, they are usually willing to mod it. The interior fabric is most important, once you have that, anyone can spiffy up a HSLD carrier that meets your needs.
Kevlar, Kevlar 129, Kevlar Protera, and Twaron are all 100% aramid.
Dr. Gary Roberts and several others who do private testing and testing for their own states recommend the U.S. Armor Eagle Enforcer Kevlar 129 vest Level IIIA. All of the testing that was done was started when the mess with Zylon first arose a few years back.
The Level IIIA U.S. Armor Eagle Enforce is priced at $400
If you don't go with US Armor, ensure that the vest you get is 100% Kevlar. Kevlar, Kevlar 129, Kevlar Protera, and Twaron are the only materials that should be trusted, all have a long proven track record.
be safe