For athletes gearing up for the 2026 HOKA UTMB Mont-Blanc, there is a new update to the mandatory gear list: the red light requirement. Event organizers are continuously working to minimize the ecological footprint of the races by reducing light pollution to protect local nocturnal wildlife.
For the uninitiated, the Ultra-Trail du Mont-Blanc (UTMB) is widely considered the pinnacle of the trail running world. It is a grueling, 171-kilometer (106-mile) ultramarathon that circumnavigates the Mont Blanc massif, crossing through France, Italy, and Switzerland while forcing runners to conquer massive elevation gains.
Runners will not be required to navigate the entire 171 km bathed in red light. The mandate specifically applies to a 6-7 km section within the Contamines-Montjoie Nature Reserve (around the 40 km mark).
Because athletes typically pass through this specific reserve exclusively at night, the rule will be strictly enforced here. Thankfully for the runners, this section is mostly a steady uphill climb and is not highly technical, making it much more manageable to navigate with a dimmer beam.
The reasoning comes down to conservation. Red light (or light shifted heavily toward the red spectrum) is significantly less disruptive to wildlife than harsh white, blue, or green LED beams. While any artificial light impacts nature, red light helps preserve the natural dark behaviors of the animals living in the reserve.
Several brands are releasing new headlamps to comply with this new rule. Fenix releases an upgraded version of their HM65R model with a red light (HM65RR V2). To compete in the market, Nitecore upgrades their UT27 headlamp into UT27-MB (an obvious name for sure), claimed to be the brightest red headlamp in the market.