Troy Lee Designs D4 Helmet

While it is engineered for downhill and BMX racing, the D4 Polyacrylite is comfortable enough for long days at the bike park. However, because it is a full-face helmet with a focus on impact protection, it may feel heavier and warmer than a dedicated trail or enduro helmet during long, high-exertion climbs.

The Mips C2 system is designed to reduce rotational forces on the brain during an angled impact. It allows the helmet to slide slightly relative to your head, which can help mitigate the severity of certain types of crashes common in downhill and BMX riding.

Yes, the cheek pads are removable and feature an anti-microbial treatment. This makes it easy to wash them after a sweaty day on the track to keep the helmet fresh and hygienic.

The collarbone suspension system is a safety feature built into the lower profile of the helmet. It is designed to help prevent the helmet shell from digging into your collarbone during a crash, potentially reducing the risk of injury in that area.

Yes, the helmet is equipped with a breakaway visor. This is a critical safety feature that allows the visor to detach during an impact, preventing it from snagging on the ground and potentially twisting your neck.

The D4 Polyacrylite features a high-flow front air intake system designed to channel air through the helmet while you are moving. While it provides decent airflow for a full-face design, it is still a protective shell, so expect it to be warmer than an open-face helmet.