Stay warm on those chilly morning runs in this top. Therma-FIT tech helps regulate your body's natural heat while the turtleneck design lets you tuck in when the breeze picks up. Extend your coverage with thumbholes at the sleeves so you're set to hit your personal record. Fit & Design: Nike Therma-FIT technology helps manage your body's natural heat to help keep you warm in cold-weather conditions Thumbholes let you extend your coverage and help hold the sleeves in place while you move Collar stretches to add face coverage Reflective bar on back helps you shine