The Airhole is standard on all masks and is designed to allow breath to escape freely, avoiding the build up of condensation to keep you dry, warm and goggles fog free. Stay out there longer. Drytech Thermal Fleeceis a high performance microfibre fabric that wicks moisture and regulates your temperature. Airholes high density, fine yarn polyester & spandex finish includes a DWR (Durable Water Repellent) coating to bead water and keep moisture away from your face, making it one of their most popular constructions.