The Houdini Pace Flow Houdi is made from a Polartec® Power Dry® Mesh, a lightweight mesh fabric that creates insulation without trapping excess heat or vapor. When worn as an outer layer it will let air flow through the garment and vent out any excess heat or moisture. When worn underneath a shell layer it will build a powerful layer of warm air that provides an exceptional level of insulation, especially considering the low weight. High insulation, low weight and exceptional breathability, that’s the magic formula. The perfect piece for high pace activities all year round.