Combating cold and windchillfor the colder days of winter having a insulating and windproof jacket is a real boon to maintain a comfortable temperature the warmer you are the more time and energy you can put in to riding and not wasting energy keeping warm the stretch in the fabric allows for a close to body fit again meaning less energy wasted battling wind resistance more energy equals more miles in comfort to seal out the cold fully a high double collar keeps in warmth and creates a comfo