Skull Cap - Cycling Under Helmet Cap - Running Helmet Liner

This skull cap is a brimless helmet liner for cycling and running, made to sit under the helmet you already own. It exists for one problem, and it is the one riders complain about every warm ride. Sweat gathers at the front of the helmet, and gravity takes it straight down onto the forehead, the eyes and the glasses.

The crown is an open eyelet knit, perforated across its whole surface so the helmet's own vents are not closed off against the scalp, and the seams are bonded flat so nothing sits proud between the cap and the shell. Laid flat it measures 13cm high and 24cm wide, in a single stretch size.

It suits riders who already know the problem. Road and gravel cyclists on warm days, commuters, runners, and anyone whose helmet sits straight onto a shaved or thinning scalp. Wearing a cap in summer sounds like the wrong move, which is precisely the point, because it goes under the vents rather than over them.

Key Features:

• Open eyelet knit is perforated right across the crown, so the vents in your helmet are not closed off against your scalp.
• Brimless design puts nothing in front of the eyebrow, so your vision stays clear and the helmet sits exactly where you fitted it.
• Low 13cm profile lies flat to the skull and leaves helmet fit and retention adjustment unchanged.
• Elasticated hem band runs across the forehead and holds the cap in position without needing to be pulled tight.
• Flat bonded seams sit inside the shell rather than pressing against the scalp or the tops of the ears.
• One stretch size fits without measuring, so there is nothing to size up or down before you order.
• Available as single caps or as two packs, so a clean one can go on the bike every ride.

We are not going to call this cap cooling or moisture wicking. Our supplier provides no fibre composition and no test data behind either word, so both would be guesses, and a guess printed on a product page is worse than a gap. What is measurable is the open knit, the absence of a brim and the 13cm profile, and that is what the description above is built on.

Terrabound stocks kit for people who already know what they need. This is a small, unglamorous piece of gear that fixes one specific annoyance on a warm ride, and it does not pretend to be anything more than that.

Pair it with our thermal balaclava for the colder half of the year, or with a pair of cycling shorts from the same range.