Virus Women's Stay Cool Sleeveless X-form Posture Support Compression Top 82% Nylon, 18% Spandex Imported UPF 50 offers great protection from harmful UV rays Biomechanical x-form design reinforces good posture and form while in motion Advanced fabric keeps skin surface temperature up to 10 degrees F warmer Ultra-wicking fabric construction keeps skin dry and comfortable Ventilated V-neck design adds to airflow and neckline comfort