The barometric pressure sensor on the flight controller (FC) is sensitive to sunlight and wind, so a piece of open-cell foam will be placed over it to protect it. The foam will shield it from direct light and high speed airflow, while still allowing enough air to pass through to accuratly measure the air pressure. The flight controller cover will further shield the electronics while still allowing you to view the flight controller.
Links
[1] http://learn.parallax.com/sites/default/files/content/ELEV-8/Tools/tool_scissors.jpg
[2] http://learn.parallax.com/sites/default/files/content/ELEV-8/Tools/tool_screwdriver.jpg
[3] https://learn.parallax.com/sites/default/files/content/ELEV-8/v3-Assembly/v3-HardwarePackSingles-Labeled.png