Helmet vents are designed to let air through, which means they also let UV rays through. On long summer rides, the skin on top of your head accumulates sun exposure through those gaps in your helmet's shell. The SPF30 Ultralight Cap from Giro addresses this with a UPF30+ rated fabric that blocks harmful rays while remaining breathable enough for hot weather use. The 96% polyester, 4% X-Static construction uses a mesh top panel that allows airflow while providing consistent sun protection across your scalp.

X-Static fibers incorporate silver directly into the material, which adds antimicrobial properties alongside the UV protection—the same technology Giro uses in their helmet padding. This helps manage odor on caps that spend hours soaking up sweat in summer heat. The mesh construction prioritizes breathability over insulation, making this a warm-weather piece rather than a shoulder-season layer.

Like Giro's Peloton Cap, the SPF30 Ultralight features Smart Seam construction that reduces pressure points under your helmet and a shortened brim that preserves peripheral vision when you're on the hoods or in the drops. The fabric is thin enough to fit under a helmet without affecting the fit or creating bulk, and the Pure White colorway reflects heat rather than absorbing it. If you're logging serious summer miles and want to protect your scalp without adding warmth, this cap fills that specific role.