The Grundens Windward Gore-Tex Jackets are the warmest insulated jacket by Grundens. These jackets were designed with warmth and wind protection in mind. Featuring a body mapped GORE-TEX Infinium windproof shell, these jackets help maintain heat while providing breathability throughout. Lower insulation: Primaloft ThermoPlume (Blowable Synthetic) Silver w/ CrossCoreShell: GORE-TEX 70d Infinium Upper Shell FabricUpper insulation: Primaloft Silver 133g/m2Shell: Woven Baffle Lower Fabric Construction