Black Diamond Heat Treat Hoody Women's. The Heat Treat Hoody features a WINDSTOPPER barrier that amplifies the insulating properties of its PrimaLoft Silver fill. It offers exceptional thermal efficiency while remaining low enough in profile to layer and be highly breathable under heavy exertion. Made for fast paced pre dawn starts, the Heat Treat Hoody offers low profile, highly breathable insulation. The addition of WINDSTOPPER provides an exponential increase in thermal retention without adding weight or bulk, making it an appropriate layering piece as well as a great stand alone jacket for a variety of uses.