Sunscreen on a sweaty scalp eventually runs into your eyes. Giro's SPF30 Ultralight Skull Cap solves this problem with a UPF30+ rated fabric that blocks UV rays while the X-Static Performance Jersey mesh wicks moisture away from your head. The white fabric reflects heat rather than absorbing it, and the mesh construction allows airflow through your helmet vents rather than trapping heat underneath. If you're dealing with a thinning hairline or simply prefer coverage under the helmet, this handles sun protection without the sunscreen-in-eyes issue.

The skull cap uses a multi-panel construction with X-Static mesh on top and power mesh side panels that stretch and breathe. X-Static fiber incorporates silver for natural odor control, so the cap stays fresher between washes than standard polyester alternatives. An elastic rear panel accommodates a range of head sizes within the one-size design, providing enough stretch to fit securely without creating pressure points.

Giro's Smart Seam construction positions the stitching to avoid pressure points when worn under a helmet, which matters when you're wearing both pieces for hours at a time. The material is thin enough to fit beneath your helmet without bunching or affecting the fit, and light enough that you'll forget it's there once you start riding. The cap absorbs sweat that would otherwise soak into your helmet padding, extending the life of those pads while keeping your head drier throughout the ride.