Troy Lee Designs D4 Polyacrylite Helmet
Best protective gear for downhill riders seeking comfort and airflow.
This full-face helmet delivers elite-level safety and airflow in a more accessible shell construction. It balances high-impact protection with a comfortable, anatomical fit, making it a top-tier choice for aggressive mountain biking without the carbon price tag.
$350.00
More D-Series options
Who it's for
- Safety-conscious riders seeking professional-grade protection on technical trails.
- Downhill racers who need maximum ventilation during high-exertion descents.
- Performance-oriented mountain bikers looking for durability without excessive weight.
Who should skip it
- Budget-focused riders who prioritize low cost over high-end brand prestige.
- Riders with wider head profiles who prefer a more relaxed fit.
- Casual trail riders seeking a lightweight or convertible helmet option.
Performance breakdown
Impact Protection
Mips C2 integration provides top-tier rotational force mitigation for aggressive riding.
Ventilation Efficiency
High-flow intake system keeps riders cool during intense, high-exertion descents.
Fit Customization
Contoured cheek pads and anatomical padding ensure a secure, personalized feel.
Structural Integrity
Polyacrylite shell offers robust durability without the weight of traditional materials.
Safety Features
Collarbone suspension system adds a critical layer of specialized impact defense.
Emergency Accessibility
Quick-release cheek pads allow for rapid, safe removal by medical personnel.
Key Specs
Mips C2 Rotational Impact Brain Protection System
Advanced Polyacrylite shell construction
Front air intake system with high flow polymer center and power grid side mesh
Collarbone Suspension System
Breakaway visor screws
Anti-microbial padding
Quick release contoured 3D cheek pads
Know before you buy
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