If you thought the incredible functionality of a vest just couldn't get any more versatile, just wait to you see our Zeroweight Windproof Warm vest. Of course, we all know how there is nothing better than a vest for keeping your core warm while providing unlimited freedom of movement, because when used as a mid-layer a vest adds critical insulation where it's needed without any extra bulk or restrictive layers where it's not. And now it's time to step your vest game up another level by adding our superlight Zeroweight insulation with amazing breathability: The secret lies in a new insulation system that provides 30% more breathability and reduces weight without losing insulating properties. Zeroweight simply offers the best warmth-to-weight ratio. And to keep it all functional we of course added a zippered pocket and increased visibility via reflective details - so you're ready for your trail run any time.