Fieldsheer has some information regarding Carbolex on their web site:http://www.fieldsheer.com/2009site/ff/Material.html
The describe it as a high performance polyester that has 90% the abrasion resistance of leather. They state that they submitted the fabric for independent testing under standardized measurements, and have a graph showing mean cycles to failure.
There are a LOT of synthetic textiles out there. Some people claim polyester is inferior, without recognizing that there are many different types of polyester fabrics. Given what they state on their tech data page above, and the fact they are still in business and have not been sued into the ground should suggest their gear is sound.