Lined with the unique silver "Omni-Heat" material inspired by the reflective heat material NASA uses to insulate spaceships.  

Columbia applies aluminum in little dots so a fabric can still act and breathe like a fabric. The silver dots reflect and help retain body heat while being highly breathable so it’s not like wearing a plastic bag.  

Omni-Heat Reflective is a way to insulate by directly reflecting the heat coming off your body.