Like Cyclic Rivers I've used a face mask as a cover but prefer home-made. Bright/light-colored fletchings can attract attention with the slightest archer movement so covers are handy to avoid getting busted. They are easy to make. Mine is from the pantsleg of an old pair of olive-colored cotton thermal underwear (open on both ends). Just cut to desired length, attach a cord through one end and tie it across the rubber grippers so that it hangs down over the fletch and nocks. Effective, quiet (low fletch noise with cotton) and easy to remove an arrow from.
It's good 'insurance'.