Girlfriend allergic to latex are non latex really safe for me and her or will cause allergic reaction what about polyurathsne and the skyns condom ?

Yes but: Non-latex condoms however do not work well in protecting against STD however.

Latex allergies...: Latex is a plastic and has chemical stabilizers, so is not just a single ingredient. One may not know which ingredient(s) in latex items she is allergic to. That means one can't be sure that all "non-latex" items won't cause a reaction. The polyurethane and synthetic condoms can be presumed safe from latex allergies, and protect agaisnt STD's. The natural "lamb" ones may have less STD protection.