Troy Lee Designs · D4 Composite
Troy Lee Designs D4 Composite
Quick Facts at a Glance
Verified Safety Snapshot
How this helmet’s verified certifications map to recognized safety homologations and crash testing.
Safety standards compliance is based on official manufacturer documentation and public safety laboratory test results. Always verify regional compliance labels on the physical helmet prior to use.
Verified Fit & Sizing Guide
Head shape profile matching and interactive size calculator based on verified manufacturer dimensions.
How to measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.
Design Concept & Background
""
Downhill/enduro with MIPS Spherical and breakaway visor.
Rider Profile & Intended Use
Where to buy
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Amazon (US)
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Price History & Trends
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Product Concept & Specifications
Troy Lee Designs (United States)Engineering & Technical Analysis
The Troy Lee Designs D4 Composite helmet prioritizes safety with its composite shell and advanced impact-absorbing liner, offering excellent protection for dirt and MX riding. Comfort is enhanced by a moisture-wicking interior and adjustable fit system, while its optimized ventilation channels ensure effective airflow to keep riders cool under intense conditions. The intermediate oval head shape accommodates a wide range of riders, balancing snug fit and all-day wearability.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Technology & Convenience
Interactive Size & Fit Finder
How to measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.
Part numbers
| Product style | MFR. product # | SKU | Availability |
|---|---|---|---|
| Gloss Black / | — |
TRO-D4CO-BLK | instock |
| Anthracite / | — |
TRO-D4CO-GRE | instock |
| Course TC-3 / | — |
TRO-D4CO-COU | instock |
| Apex Grey / | — |
TRO-D4CO-APE | instock |
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Data Confidence & Verification Provenance
Helmetsan enforces field-level verification and multi-source cross-referencing. Unverified values are explicitly flagged rather than estimated.