Is a more expensive helmet worth it?

It buys weight, shell count, ventilation, a washable liner, quieter construction and spares still catalogued in three years. It does not buy a better approval, because every helmet on sale carries one and the approval is a threshold rather than a score.

Shell count, which is the least obvious and matters most

A maker offering three shell sizes across a size range puts a small head in a small shell. A maker with one shell pads a small head into a large one — heavier, sitting higher, and looking bigger. It is published, and it is the clearest thing more money buys.

Weight, read with its condition

Composite and carbon shells weigh less than thermoplastic, and the difference is felt in the neck within an hour. Read the published weight together with the size it was measured at, since makers do not all quote the same one.

The liner, which decides the usable life

One that comes out and washes is a helmet still pleasant in its third year. One bonded in place has a service life set by its lining. And cheek pads in published thicknesses are what let a nearly-right fit be made right.

Spares, which nobody checks before buying

Visors, pads and mechanisms still catalogued three seasons on. A helmet whose parts have been discontinued is finished when its visor is scratched, whatever the shell is made of.

Where the money stops buying anything

Graphics, and race replicas of equipment you are not racing in. Both are real products and neither is an improvement you can read on a specification.

And the thing money cannot buy at all

Fit. Internal shape is not published by most makers, a costly helmet in the wrong profile presses after forty minutes, and no price corrects it.