When we need one jacket that does it all, we turn to the popular Whirlibird IV Interchange Parka from Columbia to head up to the resort or walk our dog in summer rains. The shell of the Whirlibird provides waterproof protection under everything from spring showers to snowfall on the slopes, while the zip-out liner with an Omni-Heat reflective lining and Thermarator insulation keeps you cozy when the temperatures drop. Wear them separate or put them together to combat the chill of winter.