Sweat-wicking, breathable and ready for speed, this ultralightweight running T-shirt sports targeted mesh paneling to keep you cool as the intensity heats up. Style Name: On Men's Performance-T Running T-Shirt. Style Number: 6197381. Cerulean (medium) blue/black (I would call it dark charcoal grey) It has been washed but there are a couple spots on the front and a couple picks. Each imperfection has its own picture. The lightest weight item you will ever put on.