Toss the Gore Wear C3 Gore-Tex Helmet Cover in your back pocket the next time there's a chance of rain on your ride, and keep your noggin warm and dry when Mother Nature break's loose with a downpour. Its Gore-Tex membrane sheds water and wind to keep you warm, and your hair style-ready when you get to the cafe. The helmet cover features a stretchy elastic band that cinches down around your helmet, while the polyester offers a barrier to the elements. Because Gore-Tex is naturally breathable, sweat can still escape if a big push gets you warming up in the drizzle.