D4 Carbon Mips Helmet Cyclops

What Our Gearhead® Experts Are Saying:

"The Troy Lee Designs D4 Carbon MIPS Helmet Cyclops is the most complete full-face helmet I have tested at this level, and the carbon construction is the starting point for everything that makes it work. At 1000 grams, it is meaningfully lighter than composite alternatives, which matters on a long bike park day when neck fatigue is a real performance factor. The MIPS C2 system is integrated cleanly enough that it does not create any of the fit looseness you sometimes get with rotational protection systems, and the three shell sizes mean the fit is genuinely precise rather than one-size-adjusted."

Downhill mountain biking and BMX racing share a common requirement: a helmet that can be trusted completely at the moment it matters most. The Troy Lee Designs D4 Carbon MIPS Helmet Cyclops is built to meet that standard, starting with a carbon fiber shell that delivers the stiffness-to-weight ratio no composite construction can match. At 1000 grams, the D4 Carbon sits at the top of the performance category by weight while maintaining the structural integrity demanded by CPSC 1203, CE EN1078, ASTM F1952-DH, and ASTM 2032-BMX certifications simultaneously.

The MIPS C2 rotational protection system addresses the oblique impact forces that are most common in real-world crash scenarios, working within the carbon shell to redirect rotational energy away from the brain without introducing the fit looseness that older MIPS implementations sometimes produced. The EPS liner is shaped around an updated head form with added material in critical impact zones, and the EPP collarbone impact system addresses the center lower section of the helmet specifically, a relief area engineered to reduce force transfer to the shoulder and collarbone in the kinds of crashes that full-face riders are most likely to experience.

The anatomical 3D contoured cheek pads use X-Static and XT2 antimicrobial materials and are mounted with an emergency release system operable by EMS responders, a design standard that reflects the seriousness of the disciplines this helmet is built for. A precision-fit headliner with seven anchor points works alongside the three shell sizes to deliver incremental sizing that is meaningfully more accurate than a single-shell-size approach. The titanium D-ring buckle saves weight at the chinstrap without sacrificing retention security, and the smart shear breakaway visor screws are engineered to release cleanly under impact forces rather than transferring energy into the shell.

For riders competing at the highest level of DH or BMX, or anyone who demands race-proven protection on consequential terrain, the D4 Carbon MIPS Helmet Cyclops represents the current benchmark in full-face helmet construction.