OVER TIME
Worn, not replaced.
With care, the hair lasts well over a year. The bonds are gently released and reset to follow your own hair as it grows - every three to four months - and the same hair continues to live with you.
You wash it with a sulphate-free shampoo. You let it air dry when you can. You sleep on it. You forget about it. Over months, it begins to feel less like an addition and more like the hair you have.