FOR: Running - medium and high-impact workouts - cold weather training FEEL: Chafe-free seamless fabric stretches with every move FAVE: Mock neckline is easy to layer and provides extra coziness Body-mapped texture flatters your form Nylon WICKING. BREATHABLE. UNSTINKABLE. Odor-controlling technology Machine wash & dry. Measurements: Size: Small -Armpit to Armpit flat across: 15.5” Length: 23” Size: Medium- Pit to Pit: 17” Length: 26”