Frizz, in humidity

Stop fighting it with product and start reducing how much water the hair can take. That means, in order of cost: how you dry it, how often you wash it, the cut, and — when the first three are not enough — a smoothing treatment.

A heavier wax is what most men reach for, and it is the one thing that reliably makes the result worse.

Hair absorbs water from the air. All hair does; some does it faster.

The shaft swells as it takes on moisture and its outer layer lifts. Every strand then bends slightly differently from its neighbor, and what you see is a head of hair no longer lying in one direction. Nothing has been damaged — the hair has simply responded to the weather.

This is why frizz is worst in New York in July and August, why it is worse on hair that is fine, wavy or has been lightened, and why an air-conditioned room makes it appear to settle on its own. The variable is moisture in the air, not effort.

How you dry it. Rubbing with a towel lifts the outer layer while the hair is at its most fragile — that is most of the frizz a man creates himself. Press the towel against the hair instead of scrubbing it, and let it dry without being disturbed.

How often you wash it. Every wash strips the oils that sit on the shaft and slow absorption. Daily shampoo is the most common reason hair that behaves in the salon misbehaves at home.

The cut. Length is weight, and weight is what holds hair down. A shorter, more layered cut gives each strand less room to bend out of line — the reason a fresh cut survives a humid week better than one that is five weeks old.

Product, applied correctly. A small amount on damp hair, before drying, seals the shaft as it dries. The same product applied to dry hair sits on top and reads greasy by the afternoon.

When those four are done and the hair still frizzes by ten in the morning, the honest answer is a treatment.

More product. Enough wax to hold frizz down is enough wax to make the hair look heavy and dirty. The failure is visible by mid-afternoon and it is not subtle.

Washing it again. It feels like the fix for an hour and it removes the little protection the shaft had.

Cutting it all off. It works — that is the honest reason men do it — but it is a decision about how you want to look, not a solution to humidity. If you like your hair at length, a treatment is cheaper than a style you did not want.