Troy Lee Designs D4 Helmet
Best protective headgear for dedicated downhill mountain bike enthusiasts.
Built for the rigors of downhill and BMX, this full-face helmet prioritizes high-impact safety without unnecessary bulk. It integrates advanced rotational protection and emergency-ready features, offering a secure, professional-grade fit for riders who demand reliability when navigating technical terrain at speed.
$299.99
at
Alpinebikeworks
More D-Series options
Who it's for
- Safety-conscious downhill riders seeking premium protection at a mid-range price
- Mountain bikers who prioritize breathability and temperature regulation during summer rides
- Enduro racers needing a balance of structural strength and minimal weight
Who should skip it
- Riders with wider faces who prefer a more relaxed initial fit
- Weight-obsessed professionals looking for the absolute lightest helmet available
- Frequent riders who are particularly concerned about maintaining a pristine aesthetic
Performance breakdown
Impact Protection
Mips integration provides industry-leading defense against rotational crash forces.
Weight Management
Polyacrylite construction keeps the profile light for long-duration gravity sessions.
Emergency Safety
Quick-release cheek pads ensure rapid, safe removal by medical responders.
Chin Bar Durability
EPP material offers robust energy management during high-impact frontal collisions.
Ventilation Efficiency
Airflow channels keep riders cool during intense downhill and BMX runs.
Fit and Comfort
Anatomical padding provides a secure, locked-in feel for aggressive riding.
Key Specs
Material
Polyacrylite
Safety Technology
Mips
Chin Bar Material
EPP
Helmet Type
Full Face
Intended Use
Downhill, BMX
Padding
Removable and washable
Know before you buy
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