This is Westcomb's premium jacket line. One of the main differences is the herringbone pattern of the 3-Ply eVent material, currently the most expensive eVent material to date. Westcomb's FX series' main goal is to get away from looking like a techy nerd and offer a more fashionable piece, yet not giving up anything in terms of durability and performance (it does include a powder skirt by the way). Everything about this jacket is the best. For example, the main zipper is a RiRi which is the only waterproof zipper on the market. It's also the most durable, and, yes, the most expensive. If you were to see the Mirage and the Vapor FX Hoody side by side, there would be no questions which one was the premium jacket. This is not to take anything away from the Mirage, but this new series by Westcomb is their crowning masterpiece. It is very distinctive and nothing else compares to it both in performance and style. My personal opinion is it blows anything Arc'Teryx is making out of the water. It's also made in North America (Vancouver, CAN). Differences that come to mind when compared to the Mirage include; Ninja Cuffs (makes it easier to layer), big billow front pockets made for climbing skins, riri front zipper, herringbone 3-Ply eVent material, and double-stitch seams 25 stitches per inch (looks more stylish and is just as strong as the hidden stitch of the Mirage).Simply put, if you want the best shell made, you've found it.