First full day of winter found me riding a 40 miler with parts of the ride on the more remote parts of the Perkiomen Trail. It was 68 degrees and I saw a few runners. One group of eight (4 men & 4 women) were ALL running topless. As I saw them coming I thought they were all men, but at about 80 yards it was clear they were a mixed group. I'm guessing they were in their late 20s. All smiled and waved as we passed one another.