For riders who demand top-tier protection and aggressive styling, Troy Lee Designs offers several full-face helmets built for downhill, enduro, and BMX. The five models below emphasize safety tech like MIPS, lightweight shells, and robust ventilation to keep you cool on climbs and fast descents. Whether you’re chasing race-day performance or all-day trail riding, this guide compares fit, airflow, and coverage across popular Troy Lee full-face options.
| Product | Brand | Key Features |
|---|---|---|
| Stage MIPS Stealth Full-Face Helmet (Midnight MD/LG) | Troy Lee Designs | MIPS, EPP (low-speed), EPS (high-speed); 690 g; 25 vents; break-away visor screws |
| Stage MIPS Stealth Full-Face Helmet (Midnight XS/SM) | Troy Lee Designs | MIPS, EPP/EPS system; high airflow; lightweight construction |
| SE4 Polyacrylite Helmet Mono Black LG | Troy Lee Designs | 16 vents; EPP collarbone ventilation; removable liners/cheek pads; six sizes |
| Flowline Helmet (2025) MIPS White/Black XL/XXL | Troy Lee Designs | Dual-density EPS; MIPS B-Series; 14 vents; highly adjustable fit |
| D4 Polyacrylate Helmet Shadow Timber LG | Troy Lee Designs | Polyacrylite shell; EPP collarbone protection; 24 vents; multiple shell/EPS sizes |
Stage MIPS Stealth Full-Face Helmet MD/LG
The Stage MIPS Stealth Full-Face helmet balances aggressive protection with breathable design. It uses a layered safety approach with MIPS, alongside EPP for slower impacts and EPS for high-speed scenarios. At about 690 grams, it remains fairly light for a full-face race helmet, helping reduce neck fatigue on long rides. A dedicated ventilation system with 25 intake and exhaust ports promotes continuous airflow, keeping you cooler when sprinting back up a climb or pushing through a hot race day. The chinbar features a polyacrylate lining with EXOskeleton reinforcement, while break-away visor screws offer extra safety in a crash.
Fit and comfort are supported by adjustable interior pads and a secure retention system. With a mid- to large-size range, it suits many riders who ride aggressively yet value reliable protection. If you race downhill or ride intense enduro, this helmet aims to deliver steady airflow and strong impact management without excessive weight.
Stage MIPS Stealth Full-Face Helmet XS/SM
This Stage MIPS Stealth version in XS/SM focuses on a compact, lightweight build while preserving the essential safety tech. The MIPS system works to reduce rotational forces in oblique impacts, and the internal layers of EPP and EPS adapt to varying crash dynamics. Despite the smaller shell, ventilation remains a priority, with numerous ports to promote air exchange as you pedal toward a fast section or approach a steep descent. The streamlined design minimizes weight without compromising shell strength or visor integrity, making it a viable option for smaller riders or those seeking a tightly fitted race helmet.
Riders who prioritize a snug fit will appreciate combinations of cheek pads and a secure harness. The XS/SM sizing helps ensure a balanced center of gravity and reduced wind lift at speed. This model suits riders who value aggressive protection with a lighter touch on weight, especially when sprinting to the top of a course or threading tight singletrack sections.
SE4 Polyacrylite Helmet Mono Black LG
The SE4 Polyacrylite Helmet delivers a blend of all-terrain protection and comfort. It features a full-face design with a Polyacrylite shell for solid energy absorption, and an EPP-assisted collarbone ventilation system to promote airflow around the chin and neck. The helmet includes removable and washable liners and cheek pads for a customized fit, which is particularly helpful for riders who wear glasses or prefer frequent cleaning after muddy rides. With six standard sizes, it’s easier to find a comfortable, secure fit across a wide rider population.
Ventilation is a central strength—16 cooling ports help maintain a cooler head during long climbs, while the interior padding remains soft under a fast ride. The SE4 is well-suited for riders seeking a classic, race-ready look with modern safety features and practical maintenance options.
Flowline Helmet 2025 MIPS White/Black XL/XXL
The Flowline helmet embodies modern aerodynamics with a focus on heat management. It uses dual-density EPS and MIPS B-Series rotational protection to reduce forces on oblique impacts. Ventilation is robust, featuring 14 ports that encourage airflow through the helmet and draw heat away from the head. Comfort features include a full 360-degree fit retention system with three-way rear height adjustment and a 3-way adjustable, screwless visor. This model targets riders who want a high level of adjustability and a clean, streamlined silhouette for aggressive riding styles and long days on the trail.
Flowline’s sizing spans XL to XXL, enabling larger head shapes a secure, comfortable position. The combination of MIPS and thoughtful venting makes it a versatile option for many mountain biking disciplines, from technical trails to fast DH runs.
D4 Polyacrylate Helmet Shadow Timber LG
The D4 Polyacrylite Helmet emphasizes coverage and durability with a Polyacrylite shell and an EPP collarbone protection system. Ventilation is substantial, with a layout of 24 vents—10 front intake ports, 5 overhead channeling vents, and 7 rear exhausts—designed to optimize air movement around the head. The design supports a broad fit with 3 shell sizes and 3 EPS sizes, giving a total of six size options to accommodate a wide range of head shapes. Quick-release cheek pads contribute to easier on/off and customization for different riders.
For riders who prioritize robust coverage and reliable airflow in a rugged, all-terrain helmet, the D4 offers a balanced blend of protection, comfort, and adjustability across multiple sizing options.
Buying Guide
Key purchase considerations help you choose the right Troy Lee full-face helmet for your riding style and head shape. Below are factors to weigh when comparing models:
- Ventilation and temperature management: How many vents, port design, and the overall airflow affect coolness on climbs and hot descents. Models like Stage MIPS Stealth and Flowline emphasize higher port counts and optimized air paths.
- Safety technology: All listed helmets incorporate MIPS or another rotational-impact system, plus layered foam (EPS/EPP) to absorb different impact speeds. Consider how much rotational protection you want and how the pads and liner feel against your skin.
- Weight and rigidity: Lighter helmets reduce neck strain during long races or rides, but durability matters on rough trails. The Stage MIPS Stealth tends to emphasize lightness for a full-face build, while D4 and SE4 balance protection with comfort.
- Fit and sizing: Helmet sizing must match head dimensions and shape. Look for models with multiple shell and EPS size options to achieve a secure, even fit and proper visor alignment.
- Liner removability and maintenance: Removable, washable liners and cheek pads can extend helmet life and improve hygiene after muddy rides or sweaty sessions.
- Visor adjustability and safety: A break-away or screwless visor can reduce injury risk in a crash while helping you customize line-of-sight and glare protection.
- Intended use: Racing-focused helmets may prioritize weight and aerodynamics, while all-mountain designs emphasize comfort and ventilation for longer sessions.
- Compatibility with accessories: If you wear goggles, glasses, or use face shields, check padding shapes and internal space to avoid crowding.
In short, choose a Troy Lee full-face helmet that aligns with your riding discipline, head size, and comfort preferences. If you race downhill or enduro, a lighter, highly ventilated model with strong MIPS support can improve performance and confidence. For all-day trail rides, a model with robust padding, easy maintenance, and stable fit may keep you comfortable from start to finish.