Pertex® Quantum Air is engineered with increased air permeability to provide a balance between wind resistance and breathability. The more openly woven structure of Quantum Air fabrics allows airflow through the fabric, which helps to regulate your body heat and keep you comfortable for longer. This balance of air permeability and wind resistance means Pertex® Quantum Air fabrics are perfectly suited to intense mountain pursuits. A durable water repellent (DWR) finish sheds light rain and snow to provide additional weather protection.