Gore-Tex Infinium™ fabrics provide lightweight warmth by combining total windproofness and weather resistance, while still maintaining breathability. Moisture and body heat are able to easily escape through Gore-Tex Infinium™ fabric’s billions of pores that are 900 times larger than water vapor molecules. It is these physical properties of the membrane that help prevent overheating and perspiration build-up, allowing you to maintain comfort in challenging conditions.