Great jacket. Four season use? Maybe in other parts of the country, however there is still not quite enough venting for hot Oklahoma summers. Sizing could also be an issue if you use all three layers and are a little on the 'heavy' side. I normally wear an XL jacket, however I wound up exchanging mine for a 2XL; the smaller size was a little too snug with both the rain and insulating layers zipped in. Again, for the price this is a great jacket (for those of use who can't afford all the neat BMW stuff). (Posted on 10/6/09)