In the Fall of 1999, this was a current style in the Patagonia line.  It was style # 25300 and made in the USA.  The Jacket is a Polartec Grid Fleece called the Regulator, designed to regulate body temperature. 

This jacket has been hanging in the back of an upstairs closet for many years.  It is in great shape, the zippers work well and still have the original pulls, the fleece is not damaged at all. Hopefully you can see the grid pattern fleece in the pictures and also note the polar stretch fabric down the sides, making it a comfortable jacket with stretch components. It's a men's large, a rather generous fitting large, as was the style in that time period.