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 and damage to the upper body whilst improving postural awareness, increasing performance and reducing risk of injury. PWX Vent panels through centre back and 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 and 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.