You will notice that some helmets in our guide have peaks, while others don't. Generally, helmets designed for trail riding, enduro and downhill will feature peaks to help keep dirt, weather and tree branches out of a rider's face while they ride narrow trails.
Many cross-country riders opt for helmets without peaks as they give better ventilation, weigh less and offer better aerodynamics, as cross-country mountain biking is generally faster-paced this can make a significant difference in comfort and speed.