Waterproof jackets are designed to provide complete protection from rain and snow. Good waterproof jackets are breathable and allow excess heat and moisture to escape.
Water-resistant jackets will provide protection from rain and snow for a limited period of time. Lighter weight and less insulated than fully waterproof jackets, water-resistant jackets are particularly useful for shorted and higher intensity runs in wet weather.
Thermal clothing, 2-3 layers of technical running clothing trap pockets of heat and insulate the body, protecting against the wind and cooler temperatures.
Reflective clothing, brightly coloured clothing or clothing enhanced with reflective strips and details, will improve your chances of being seen by drivers, cyclists and pedestrians in dark winter conditions.