On Running has the Lightweight but then what's the Zero Cap? When you're lighter than lightweight, you're pushing up against nothingness. The Zero Cap strips things down to an almost non-existent weight for your race day needs. The sweat-wicking fabric and minimal design leave you with nothing more than the bare essentials, so there's nothing slowing you down.

With laser-cut ventilation holes along the side of the crown, you'll be able to shed heat faster than you can generate it. Reflective branding adds extra low-light visibility, allowing you to keep safe when on the road in the evening and at dawn.