I had a BAD experience wih this last fall on a rainy 35 degree day. Shorts got soaked and I essentially frost bit my willy, and not just the tip. Wearing any type of tight clothing was horrible for 3-4 days and I esentially ended up wrapping it up like I had burned it. You def. need a second layer to block the wind, shrinkage just doesn't get it. Havn't found the magic bullet yet as far as comfort/effectiveness but a well placed sock helps. Plus if you run wih chicks.....