Stay away from cotton because cotton will absorb the sweat and end up keeping you colder than desired. Next comes the insulation layer, consisting of wool or fleece sweaters for the torso and glove liners for your hands. Basically, this layer provides most of the warmth and can be easily shed if pulling all of those tricks makes you too hot. Last, you need an outerlayer to protect you from the elements. The key adjective for this layer, consisting of a jacket and snowboard pants, is waterproof .
Nothing is more miserable than being wet while trying to navigate down a steep glacier.
Also, material for this layer should be made of rugged, tough, breathable fabric and should be baggy enough to allow for movement to execute all those high flying maneuvers or to just prevent becoming lodged in between two trees. Material like denim should be avoided at all costs. When suiting up, dress for colder than predicted. On your hands, you will need some waterproof gloves or mitts, which should also be rugged, breathable, and tough. Additionally, try to wear goggles rather than sunglasses.