I was advised at the LBS to "cover your knees @ 65 degrees." Is this an attempt to sell knickers and leg warmers or solid words of wisdom? He went on to say that some racers won't go under 70 degrees without covering the knees because there is no meat to shield you from the cold wind. I suppose this would accelerate possible injuries? The reason I ask the forum is because I would imagine that once you got warmed up this would not matter....but what do I know.