There is much talk about the value of Ventile fabric, but, are there any alternative natural fabrics that do a similar job. I know af another cotton based fabric that uses 30% more cotton than normal in it's construction, and all are long stable fibres, it is totally wind proof and will swell when wet to help with the water repellency, just as ventile does, yet for reasons of copyright cannot be classified as ventile. Is "Ventile" just a brand name like "Goretex" or "Hoover"?