“great lightweight workout or racewear”

“I've had one for four years (Transition Tee same jacket without the full length zipper) Have used it mainly for nordic skiing, including racing and never been disappointed. As long as your moving fast its enough to keep you warm down to around 15 or 20 degrees F. Also somewhat waterproof. I plan to start using it for biking as well. Medium is a fairly tight fit for me (5'11, 165) Just enough room for one thin tee shirt underneath, but its surprising how warm such a thin piece of clothing will keep you!”