This long sleeve shirt will provide lightweight warmth and 360 degree reflectivity for your sunset walk or run. So that you are visible in the dark, Brooks placed 3M™ Scotchlite™ Carbon Black Stretch reflectivity in critical motion zones to help drivers recognize you as a runner in motion from up to 600 feet away. DriLayer fabric offers warmth that stays breathable and wicks sweat so you won't overheat. The shirt is made with recycled fabric equal to thirteen plastic water bottles. This is a shirt that allows for unrestricted movement thanks to the stretchy fabric and updated design. It is a semi-fitted shirt and even has thumbholes for a stay-put fit that makes sure you “Run Happy.”