Mountain biking in cold weather has always been a challenge. The problem is that you'll start out cold then warm up and break a sweat, making yourself wet. Then, when you travel downhill, the combination of wet skin and windchill will be quite chilling. In cold temperatures, your feet are the most vulnerable part of your anatomy. Pressure from pedaling will tend to cut off the circulation to your toes, which can put you at a risk of frostbite.

Polypropylene is the best material here, as it is lightweight and best for colder temperaturesMoving air is the biggest cause for losing body heat. By having good wind protection you'll be able to vent perspiration while also protecting yourself from windchill. You should choose pants and a jacket based on durability, breathing, and price as these types of clothing can get very experience.Your head is very important, as you lose 50% of your body heat through your head. A helmet is designed to keep you cool in the summer, not warm in the winter. A fleece liner inside your helmet will keep your head and ears warm during winter riding.