Troy Lee Designs D4 Polyacrylite

The primary difference is the shell material. The Polyacrylite version uses a durable, slightly heavier composite shell, whereas the carbon version is lighter and stiffer. Both models share the same safety features, including the Mips C2 system and collarbone impact protection.

While it is designed primarily for downhill, BMX, and gravity riding, it is quite heavy compared to a dedicated trail helmet. If you plan on doing a lot of pedaling, you might find the weight and limited ventilation compared to a half-shell or convertible helmet to be restrictive.

The helmet features a recessed area along the bottom edge designed to create space between the helmet and your collarbone. This helps mitigate the risk of clavicle fractures during a crash by preventing the helmet from driving directly into the bone upon impact.

Yes, the interior padding is fully removable and washable. It is also treated with anti-microbial materials to help manage odor and keep the interior fresh over time.

The visor is designed with breakaway screws specifically to shear off during an impact, which helps reduce rotational forces on your head. You can easily purchase replacement screw kits from Troy Lee Designs to get your visor back in working order.

In the event of an accident, these pads can be pulled out by medical personnel without removing the entire helmet. This allows for safer removal of the helmet while minimizing movement of the rider's neck and spine.