My commute is 11.5 miles each way, mostly downhill TO work. If the morning temps are 60 or below, I can get to work with very little sweat, but I'll wear a pair of cycling shorts. Above 60, it's cycling short & jersey. Oh, and I can wear jeans & polo shirts at work, but they get too sweaty, even on cool mornings. I can't do my commute at any speed or temperature without sweating at least a little. I want to try some merino wool shirts.