No size tag, fits like a large. We designed this technical running shirt to act like a second skin - one that wicks moisture, vents steam and doesn't restrict our movement. The high neck helps keep out the cold but can be zipped down when our run heats up. Key features half-zip provides easy on-and-off access Silverescent mesh panelling under the arms is anti-stink so this shirt won't hold smell post-wash the silky-soft moisture-wicking fabric pulls sweat away from your skin four-way stretch won't restict your swift arms