Revolutionary IonX technology uses negatively charged ions to enhance your workout from start to finish. The negative ions interact with your body to stimulate blood flow and deliver oxygen to your muscle tissue more efficiently while activating receptors and chemicals that improve muscle function. Compression fit provides muscle support while fast drying moisture management and antibacterial treatment keeps you light and fresh-smelling. Built in UPF of 30+ provides protection from harmful sun rays. Elastic waist and open hem. 65/21/14 nylon/polyester/Lycra. Imported.