Nike Lunar Speed Green Blue Women's Running Shoes in US size 6.5 (UK size 4, EU size 37.5) are athletic sneakers designed for women. The low-top shoe shaft style features a green and blue color scheme with Nike's logo as an accent. The model number is 555394-313, and the shoes belong to the Nike Lunar product line. These sneakers were released in 2012 and are suitable for sports and athleisure wear.