Nike ACG Dri FIT T Shirt (Men's) Size:M Hydration compatible: yes (internal loop Colour:Wolf Grey Hydration compatible: yes (internal loop for bladder and central button hole hose exit) Lighting Technology Lighting Color Lighting Levels Brightness Distance Burn Time Reserve Lighting REACTIVE LIGHTING® White MAX BURN TIME 15 to 250 lm 70 m 10 to 64 h 10 lm for 2 h STANDARD 30 to 550 lm 100 m 5 to 40 h MAX POWER 50 to 1500 lm 200 m 2 to 24 h STANDARD LIGHTING* MAX BURN TIME 10 lm 10 m 80 h STANDARD 250 lm 70 m 5 h MAX POWER 900 lm 140 m 2 h STANDARD LIGHTING Rear Red Light Continuous 2 lm 2 This tee is made with Dri FIT tech that moves sweat away from the skin for quicker evaporation The soft feel and loose fit help keep you comfortable all day long