In terms of a warmth-to-weight ratio, few coats can compete with the Columbia Diamond 890 Turbodown Hooded Jacket. A four layer sandwich of heat-trapping technology kept us warm and mobile, even when we were ice climbing in zero degree windchill. Here's how: The inner liner of the jacket is covered in thousands of silver dots that bounce heat back towards the body, like an emergency space blanket. Next comes 40 grams of synthetic insulation — the same that sits in a normal puffy jacket — and a meaty layer of water resistant 850-fill down. It's all wrapped up in a wind and water resistant nylon shell that's backed with another layer of reflective dots. All that technology amounts to an stuffable all-winter jacket just slightly thicker than a down sweater. Your move, winter. [$350; columbia.com]
The Columbia Diamond 890 Turbodown Hooded Jacket offers cold-beating power without any of the bulk.