Crafted from lightweight PWX fabric with circular knit 360-degree stretch, the 2XU Aero Compression Shorts wrap your muscles in a tight compression fit to reduce muscle movement and damage while improving blood flow and speeding up recovery. HeiQ Smart Temp technology keeps you by increasing evaporation as your body temperature rises so you remain dry and focused. A drawstring waistband ensures a secure fit and a zipper back pocket keeps small items like your card or keys safe. Finished with reflective detailing to keep you visible in low light. Care Instructions Machine wash in cold water with like colors. Do not tumble dry. Hang to dry in a cool shady area away from the sun. Do not use bleach, fabric softeners or dryer sheets. Do not iron.