No size tag or size dot. I believe that is the correct style. PTP = 21” On sweaty runs, the lightweight fabric and deep armholes of this tank help you feel the breeze. seriously light™ luon Our sweat-wicking, four-way stretch Seriously Light™ Luon fabric makes moving a breeze seriously lightweight sweat-wicking four-way stretch cottony-soft features Designed for: Run Relaxed fit: Gives you room to move freely Breathability: Deep armholes and an open back for airflow Silverescent® technology: Powered by X-STATIC®, it inhibits the growth of odour-causing bacteria on the garment