From the Bog Dog team:
GORE-TEX® Windstopper fabric technology provides wind protection and water resistance, perfect for changeable weather conditions.
Our Tech GORE-TEX® Windstopper Jacket is a unique combination of everything Mountain Equipment know about the harsh outdoor conditions and protection and everything we know about running. Made with the GORE-TEX® Windstopper fabric technology this running jacket provides premium wind protection and water resistance, perfect for changeable weather conditions. It features a venting tab for better breathability and a secure pocket with internal fob pocket to keep your valuables safe. The Tech GORE-TEX® Windstopper Jacket has a slim fit and features reflectivity stripes across the front and back.