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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 neck shaper. No need for mirror, so you can use it even in the shower.
