The Bontrager Circuit’s hard shell extends all the way under the helmet and into the interior, increasing this tough lid’s damage resistance. The exterior shell extends further into the vents than most too.
Despite having plenty of mass we still found it very airy, thanks to the deeply sculpted, airflow-encouraging vents. It’s highly adjustable – five vertical points at the rear provide a 3cm range, and there are two horizontal points on the cradle anchors.
Padding is minimal but the highly meshed silver threaded pads are very quick to dry and odour free. The high quality and modest price make this one of the best lids around.