Visual density is built into the cut, not faked with product. Done right, the haircut adds the appearance of fullness — done wrong, it removes it.
Shorter on the sides, considered length on top
Contrast creates the visual impression of density. Keep the sides clean and short, leave a little more length on top, and the eye reads more hair than is technically there.
Layering matters more than length
Blunt-cut hair sits flat. Layered hair stands. A skilled barber removes weight from underneath while leaving length on the surface, which is what creates lift and apparent fullness.
Finish for texture, not shine
Matte clay or paste outperforms glossy pomade for the appearance of density. Shine flattens; texture lifts.
—SIR Management