This is black and periwinkle blue - not grey! It uses Nike Dri-FIT technology, which is a moisture-wicking fabric (typically a polyester/spandex blend) designed to move sweat away from your skin, helping you stay dry and comfortable. The top has long sleeves with thumbholes to extend coverage and keep the sleeves in place during movement. The half-zip design allows for adjustable airflow and coverage. PTP 17” 89% polyester / 11% spandex