From the manufacturer

Alpha Trail Down Jacket

Built for serious warmth on its own or as a powerful mid-layer is the Alpha Trail Down Jacket. Featuring Columbia's most advanced thermal-reflective lining technology, the jacket is like a cozy lightweight blanket that does an incredible job at keeping you warm using your own body heat.

FEATURES

Omni-Heat 3D

The Omni-Heat 3D is the next dimension of warmth

800 fill power

Responsibly sourced insulation with 800 fill power that offers excellent warmth to weight ratio

Water resistant fabric

Water resistant fabric

Draw-cord Adjustment

Draw-cord Adjustment at hem for a better fit

Omni-Heat 3D technology

Omni-Heat 3D technology is the next dimension of warmth. It has a thermal reflective lining that reflects your body heat for warmth while maintaining a high level of breathability and microscopic tufts of soft fibres that work to add an “air gap” to further improve heat retention while providing next to skin comfort. This breathable warming technology helps regulate your temperature to retain the warmth your body generates. So no matter how cold a climate you encounter, you can always make your own heat.