AIRTUBE ERGO SIZE M/L DRYTECH Airtube Ergo Oslo DRYTECH THERMAL FLEECE is a high performance microfibre fabric that wicks moisture and regulates your temperature. Our 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 our most popular constructions.