Haircuts that require shaving the neck are no longer a challenge with the HairLine. Just put it on like a reversed sun-glasses and use the razor touching the HairLine as a template.

If you do haircuts that require shaving the neck on your own head, you know the challenge: the ends of the hair should form a straight line, not too high, not too low, not crooked, that curves just right toward the ears. It requires two mirrors and much coordination. The HairLine does that for you: just put it on like a reversed glasses and use the razor touching the HairLine as a template. No need for mirror, so you can use it even in the shower.