Generous vents on the outside and cut-in airflow channels on ... And, like most mountain-bike helmets, it provides more coverage for the back of the head than road-bike helmets do.

In one test, we drop helmets going 14 mph onto a flat anvil to find out how well they would protect a bike rider's head ...

Bicycle helmets already have built-in drainage ... Fill it with water, some stones, and a few fish for an indoor pond.

The best e-bike helmets are designed to offer better protection for riders of electric bikes. As e-bikes are faster and weigh more, there's greater momentum if you crash, which creates higher ...