Your helmet is great in the summer, with plenty of vents to keep air moving to keep your head cool. However, when temperatures start to drop, you need to add the Gore Wear C3 Gore Winstopper Helmet Cap to your combination to keep yourself warm. This hat features a Gore Windstopper membrane to defend your head against heat loss without trapping air in--keeping you from overheating. The synthetic interior efficiently wicks away moisture, so no matter how hard you pedal you can expect to stay dry, while an elastic binding keeps the stretchy fabric from moving around.