For runners in cold climates, it’s most important to have insulation at the core (chest, torso), however traditional insulation such as down can often clump or get “wetted out” with high levels of rain or sweat. Oiselle’s Flyout insulated styles (Jacket and Vest) use an innovative new solution from Polartec®: Alpha Insulation. Alpha is constructed much like a knit, however, in lightweight and lofted synthetic insulation. This insulation acts as a layer between the outer and inner fabrics of the garment that holds onto heat, much like down - protecting the wearer. Unlike down, however, Alpha does not wet out or clump down. It also does not require baffling or stitch lines, and is washer, dryer friendly.

For care, see How to Care for Lightweight Rain Shells and Outerwear