Providing lightweight flexible support, the 2XU Core Compression Long Sleeve Top is made from powerful PWX fabric with circular knit 360-degree stretch to reduces muscle movement & damage to the upper body whilst improving postural awareness, increasing performance & reducing risk of injury. PWX Vent panels through centre back & under arms improve air flow by almost 200%, increasing evaporation of your sweat to keep you at optimal performance temperature while durable moisture-wicking keep you dry & free from distraction. Care Instructions Machine wash in cold water with like colours. Do not tumble dry. Hang to dry in a cool shady area away from sun. Do not use bleach, fabric softeners or dryer sheets. Do not iron.