There is a general rule of thumb you can use to prepare yourself for running in colder weather: dress as if it is 20 degrees warmer outside than it actually is. The general tendency (especially for individuals who are inexperienced at exercising in cold weather) is to WAY overdress, which actually makes you colder in the long run because you sweat more. Wicking materials and effective layering can help you avoid the unpleasant sensation of your t-shirt turning into a sheet of ice.
The Layering System:
-Base Layer
-First layer against the skin
-Should fit snugly
-Should be an effective moisture manager
Smartwool NTS baselayer - as we know, merino wool is an especially good moisture manager. It is also soft against the skin and who could forget its antimicrobial benefits?
-Provides insulation
-Should fit less snugly in order to trap a layer of warm air between itself and the baselayer
-Should be an effective moisture manager
Mizuno Breath Thermo 1/4 zip - Breath thermo fabric actually heats up as it comes into contact with moisture. If you haven't tried out the samples we have of this fabric, you will be amazed when you do!
-Provides protection from the elements
-Holds in heat while allowing moisture to escape
-Should fit loosely over other layers
-Could fall into any of the following categories: Windproof, Waterproof, Water repellant, water resistant.
New Balance Windblocker Jacket - this top also comes in a 1/2 zip. As you might have guessed from the name, the front panel of the jacket is windproof and water repellant, but it is also fleece lined. This is my absolute favorite top to run in when the temperatures drop. It is extremely warm - I made it through most of the winter last year wearing a short sleeved baselayer underneath this top.