http://www.newsweek.com/cold-weather-running-gear-what-you-need-exercise-winter-1639490

It can be easier to shed layers to run in the summer heat than it can be to go running in the rain and cold weather. Even the chill of early mornings can be enough to tempt shutting off the alarm and staying in a warm bed. With a few pieces of gear made for cool or wet conditions, however, running in the rain and cold temps could be much more enjoyable.

The key for running throughout the winter is gear that can block the environment without trapping in all the heat. Running gear should always have an element of ventilation to it so that moisture has an escape route.