Different types of outdoor activities call for different types of equipment, and base layers are no exception. From recreational activities like snowshoeing on the local trail to high output activities like running and skiing, picking the right equipment is crucial. Because there are so many different types of activities, we at Garneau developed four levels of base layers, the 6000, 4000, 3000 and 2000 series. The 3000 Zip Neck baselayer top offers superior stretch with a brushed inner face that regulates temperature through airflow. Its seamless construction eliminates friction against the skin.