Eliminate skull-freeze.Today's helmets have plenty of vents that provide cooling when worn during hot summer rides, but when we venture out into frigid climates wearing these skeletal brain-caps, we wish they weren't quite so breezy. The Louis Garneau Hat Cover 2 provides warmth and protection from the weather when worn under your space-age lid, or you can wear it on its own when you're warming up or cooling down.The Hat Cover 2 is made of two fabrics. LG's Enerblock fabric covers the forehead, ears, and back of the head. It's a stretchy polyester knit with a soft back and breathable polyurethane membrane that keeps out wind and water. Heatmaxx fabric covers the top of the head. It's a traditional nylon weave with a brushed back that provides insulation and softness. As a finishing touch, the front logo is reflective for an added hint of visibility.