Winter what winter skins dnamic thermal long sleeve top with mock neck and zip is the upper body base layer you need to train outdoors in cold conditions with a 5cm mock neck centre front zip and breathable airflow mesh under the arms it will keep you warm and comfortable this winter thermal fabric for warmth in temperatures as low as 20c 4fstretch airflow mesh under the arm for increased range of motion and breathabilityinternal silicon gripper stops tops from riding upreflective lo