Mountain biking can be risky without the right protection. The Troy Lee Designs Flowline Helmet offers safety and comfort for every ride.
This helmet is designed to provide maximum protection while maintaining a lightweight feel. With MIPS technology, it efficiently reduces rotational forces during impacts, ensuring your safety. The breathable materials simplify long rides, keeping you cool and comfortable.
In our full review, we break down performance, durability, and more to help you choose the best helmet for your mountain biking adventures.


Troy Lee Designs Flowline MIPS Helmet
The adjustable valve sets the Troy Lee Designs Flowline Helmet apart, ensuring a custom fit and maximum comfort for mountain bikers. Constructed from dual density EPS, this helmet is designed to absorb both low and high-speed impacts effectively. The helmet features a MIPS B-Series rotational impact system, enhancing safety by reducing rotational forces during crashes. With dimensions tailored for X-Large to XX-Large sizes, it caters to a wide range of head sizes.
Key Advantages
- The 14 total vented ports facilitate optimal airflow, keeping riders cool by drawing heat out while allowing fresh air in.
Limitations
- Not compatible with certain aftermarket accessories, limiting customization options for some users.
This helmet is best for outdoor enthusiasts needing a reliable and comfortable head protection solution during intense mountain biking sessions. Its combination of safety features and ventilation makes it an excellent choice for those who prioritize both performance and comfort on the trails.
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Troy Lee Designs D4 Helmet Shadow Timber
The adjustable valve sets the Troy Lee Designs – D4 POLYACRYLITE Helmet apart from its competitors. Constructed with a durable polyacrylite shell and an EPP collarbone impact liner, this helmet ensures maximum protection. It is available in three shell sizes and three EPS sizes, accommodating a wide range of head shapes with a total of six sizes from XS to XXL.
Key Advantages
- The use of 316-grade stainless steel D-rings resists corrosion and enhances durability, making it suitable for various weather conditions.
- With 24 ventilation ports, including 10 front intake ports, 5 overhead channeling intake vents, and 7 rear exhaust ports, airflow is optimized for cooling during intense rides.
- The anatomical design and quick-release “3D” cheek pads provide a comfortable fit, reducing fatigue during long rides.
- The removable and washable Coolmax-Dri-lex comfort liner ensures hygiene and comfort over time.
Limitations
- Not compatible with aftermarket visors, limiting customization options for some users.
- Due to its advanced materials and construction, it comes at a higher price point compared to basic helmets.
This helmet is best for outdoor enthusiasts needing a high-performance, protective, and comfortable option for mountain biking or other extreme sports. Its blend of safety features and comfort makes it a top choice for serious riders.
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Troy Lee Designs D4 Carbon Helmet
The adjustable visor sets the Troy Lee Designs D4 Carbon Helmet apart, providing riders with customizable visibility and protection. Constructed from lightweight carbon fiber, this helmet weighs significantly less than traditional models, enhancing comfort during extended rides. Its dimensions cater to a snug fit for small sizes, ensuring safety without compromising on comfort.
Key Advantages
- The MIPS technology effectively reduces rotational forces during impacts, significantly lowering the risk of head injuries.
- 316-grade stainless steel components in the buckle system resist corrosion, ensuring durability in various environments.
- With 24 ventilation ports, the helmet promotes superior airflow, keeping riders cool even in high-intensity situations.
- The moisture-wicking, removable liner enhances hygiene and comfort, making it suitable for prolonged use.
Limitations
- Not compatible with motorized vehicles, limiting its use to non-motorized biking activities.
Best for outdoor enthusiasts needing a high-performance helmet that combines safety, comfort, and style. The D4 Carbon Helmet excels in competitive and recreational settings, making it an essential gear for serious riders.
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Troy Lee Designs SE4 Helmet Warped Black/Copper
The ventilated design sets the Troy Lee Designs – SE4 POLYACRYLITE Helmet apart in the competitive market of performance full-face helmets. Featuring 16 strategically placed cooling vent ports, this helmet ensures optimal airflow, enhancing rider comfort during intense races. Constructed from durable materials, including a lightweight polyacrylite shell, it meets the DOT FMVSS 218 Standard, providing peace of mind regarding safety. The helmet is available in six standard sizes, ensuring a snug and secure fit for various head shapes.
Key Advantages
- 316-grade stainless steel hardware resists corrosion, ensuring longevity in harsh outdoor conditions.
- MIPS technology enhances impact protection, reducing rotational forces during crashes.
- The EPP collarbone ventilation system minimizes the risk of injury while providing additional airflow.
Limitations
- Not compatible with certain aftermarket accessories, limiting customization options.
- The helmet may feel bulky for riders accustomed to lighter models.
Best for outdoor enthusiasts needing a reliable, high-performance helmet for racing or off-road adventures, the Troy Lee Designs SE4 POLYACRYLITE Helmet combines safety, comfort, and breathability, making it an excellent choice for serious riders seeking top-tier protection.
To buy this product, click here.
Troy Lee Designs A2 MIPS Helmet
The adjustable valve sets the Troy Lee Designs – A2 MIPS Helmet apart from its competitors, offering customizable airflow and comfort for riders. Constructed from aerospace filament-reinforced polycarbonate, this helmet ensures durability while remaining lightweight, with a claimed weight of just 12.3oz for medium/large sizes. The large vents enhance ventilation, providing optimal airflow during intense rides, and the rear stabilizer fit system allows for an adjustable and secure fit tailored to individual head shapes.
Key Advantages
- The use of 316-grade stainless steel in the retention system resists corrosion, ensuring longevity even in harsh conditions.
Limitations
- Not compatible with certain aftermarket visors, limiting customization options for some users.
This helmet is best for outdoor enthusiasts needing a lightweight, durable helmet that offers superior ventilation and fit adjustments. Its advanced materials and design make it ideal for mountain bikers seeking both performance and protection on challenging trails.
To buy this product, click here.
Faq about Troy Lee Full Face Mountain Bike Helmet:
1:What is the Troy Lee Full Face Mountain Bike Helmet?
The Troy Lee Full Face Mountain Bike Helmet is a protective headgear designed for mountain biking, offering enhanced safety and impact resistance.
2:What features does this helmet have?
This helmet includes a lightweight design, ventilation for comfort, adjustable visor, and a secure fit system for optimal protection.
3:How do I choose the right size?
Measure your head circumference and refer to the Troy Lee size chart to select the appropriate helmet size for a snug fit.
4:Is it suitable for downhill biking?
Yes, the Troy Lee Full Face Mountain Bike Helmet is specifically designed for downhill biking and extreme riding conditions.
5:How do I clean the helmet?
Use mild soap and water to clean the exterior, and remove the inner padding for washing as per the manufacturer’s instructions.
6:Does it meet safety standards?
Yes, it meets various safety standards, ensuring reliable protection during rides.
7:Can I use it for other sports?
This helmet is primarily designed for mountain biking and may not be suitable for other sports due to specific safety requirements.
Conclusion
Both the Troy Lee Designs Flowline MIPS Helmet and the D4 Helmet Shadow Timber exemplify superior craftsmanship and innovative safety features, catering to the discerning mountain biking enthusiast. The Flowline MIPS Helmet offers a lightweight design complemented by advanced impact protection, ensuring riders maintain agility without compromising safety.
Conversely, the D4 Helmet Shadow Timber stands out with its exceptional ventilation and robust construction, providing unparalleled comfort during rigorous rides. Together, these helmets underscore the brand’s commitment to performance and protection, solidifying their status as premier choices for avid cyclists seeking both style and safety.




