BREATHABLE FOR MILES. The Nike Breathe Miler Tank delivers lightweight breathability. Sweat-wicking mesh fabric helps keep you cool, while an open back adds even more ventilation as your trail heats up. Nike Breathe fabric helps you stay dry and cool. Mesh fabric provides all-over breathability. An open back at the neckline allows ventilation. Curved back hem helps keep you covered as you run. More details: reflective details. Standard fit for a relaxed, easy feel. Machine wash.