The vinyl window will fold in the middle. However, you should use the legendary 'chop.' Once the top is down half way karate chop the window (lightly) so it folds the rest of the way without any creases in it. If you get a crease the window can crack. Also, it has been recommended to me not to changing the position of the top below 40°, however I agree 60° is a much safer temperature, the vinyl hardens at low temps and makes a crack more likely.
This summer when it's 85° you will see just how much the temperature can affect the vinyl, it can get very soft in the summer. Which is great because you can drop the top at a stop light and not worrying about creases that much.
