Nike Dri-Fit - is an innovative fabric technology designed for great moisture management in hot conditions. Mock Neck - helps lock in heat and provide a snug fit on your neck Half zip - for easy access and removal. Sleeve hem with thumbhole - to shut out the elements but keep your movement free. Reflective Piping - keeps you visible in low light conditions at night. 18.25“ underarm, 25.5“ L Shop all colors