Snowbuddy wrote an answer about Mountain Hardwear WindStopper Tech Jacket - Men's on November 20, 2010
Today it was in the low 40's and I had to make a stop at the mall. T shirt is what I had on underneath it. I love the breath-ability of it because you will not need to take it off and carry it when indoors like at he mall. If I do get warmer, unzipping does the trick. Not the best insulator though because it's breath-ability. For winter use you are looking at this as more of a layering piece.