The Haute Route is Mammut’s ISPO Award-winning first-ever triple-certified helmet. Engineered to be lightweight yet exceptionally strong, it is purpose-built for the rigors of skiing, climbing, and biking. Now updated with Mips® and twiceme® technology, it has solidified its place as one of the best ski helmets I have ever used.

The Mammut Haute Route Helmet review

Outer Shell: ABS
Inner: EPP and EPS foam
Adjustment: 360° spherical wheel adjustment system with six positions
Size Tested: 59-63 cm
Testers Head Size: 62cm
Country of Origin: China

What is the Haute Route

The Mammut Haute Route helmet is named after the world’s most iconic ski traverse, which sees ski tourers and splitboarders travel from Chamonix to Zermatt. The route demands a mix of high-end ski touring, technical climbing, and overall badass skiing.

Mammut designed this helmet to protect your noggin through every stage of that journey—from the bike ride to the lift and the long descent of the Vallée Blanche to the final technical climb up the Matterhorn. If you decide to race back the other way, it is fully ISMF (International Ski Mountaineering Federation) certified, meaning it’s race-legal for grueling events like the Patrouille des Glaciers (PDG) to Verbier.

In a world of specialized gear, this is a lightweight “jack of all trades” that manages to be a master of them, too.

Construction and Certification

CE EN 1078 (biking)
CE EN 1077: 2007 CLASS B (skiing)
EN 12492 (climbing)

The white outer shell of the Haute Route is constructed from ABS, a rugged plastic that is easily shaped during manufacturing but becomes incredibly durable in freezing temperatures. It handles the “day-to-day” bumps and bashes in stride, dispersing the energy of smaller impacts evenly across the internal structure.

Inside, the helmet utilizes a dual-foam construction. EPP (Expanded Polypropylene) makes up the majority of the helmet’s body, providing durability and the ability to withstand multiple small knocks. This is paired with EPS (Expanded Polystyrene) inserts in critical zones. Both foams are engineered to compress or “fail” during a significant impact, sacrificing themselves to absorb the energy and protect your brain.

Fit and Comfort

The Mammut Haute Route features a traditional oval shape that should suit a wide range of head shapes. Internal comfort is managed by removable and washable “all-season” padding. The padding is just thick enough to prevent pressure points without adding excessive insulation making it ideal for high-output ski touring or biking on a hot summer day. For colder missions, Mammut includes a thin fleece beanie that actually matches the size of my head and covers my ears. I usually wear the Arcteryx Proton hat underneath so my ears are always covered.

While a standard chin strap keeps the helmet secure, the real magic is Mammut’s 360° Adjustment System. This harness wraps entirely around the head and is tightened via a micro-dial at the rear. The height of this system can also be customized using an internal height adjustment ladder that helps the dial cradle the back of the head.

After two seasons of heavy use, I have noticed some wear on the height-adjustment ladder. When the helmet is strapped to the outside of a pack, the head cradle gets pushed back in, forcefully if you are not paying close attention. For the first year, I was not. Alas, one side has eventually worn out, though the other remains functional. Additionally, the 360° harness has popped out of its mount once or twice, but the push-button design makes it easy to snap back into place while in the field.

Adjustment Dial on the 360° Adjustment System

Adjustment ladders for the 360° Adjustment System. The right side is worn out.

All Season Padding and the 360° Adjustment System

Goggle and Headlamp Retention

At the rear of the helmet is a standard goggle shock cord that secures over a small lip at the base. Moving forward, you’ll find two additional shock cords designed to run down and back to secure a goggle or headlamp strap. Honestly, I don’t use these cords at all—they make adjusting goggles feel incredibly awkward. While they are intended to prevent your goggles from flying off when pushed up onto your forehead, that’s a “catastrophe” I’ve only experienced twice in a decade. If you’re like me, you might find yourself wanting to slice these off to simplify the setup.

The front of the helmet meshes well with all of the goggles I used. 100% Knorg, Anon M5 and Sync as well as the Poc Fovea.

At very front of the helmet are two dedicated notches designed to keep a headlamp strap from sliding up the shell. Unlike the shock cords, these are low-profile, highly effective, and definitely a useful addition for pre-dawn starts or late finishes. My nitecore headlamps have a smaller strap and therefore cannot reach down to the side straps and would definitely fly off the top without the notches.

Overall Impressions

I absolutely love the Mammut Haute Route. It is easily my favorite touring helmet, and quite possibly the best overall helmet I have ever used. Its svelte silhouette and minimal weight mean it is nowhere near as cumbersome as the bulky helmets of the past. I love that it doesn’t make my already large head look even larger.

Thanks to its breathability and comfort, I typically put this helmet on at the start of the trailhead and barring a massive mid-day warmup, leave it on for the entire day, uphill and downhill.

I have worn it for at least 125 days over the last two seasons and it has taken an absolute beating. The ABS outer shell is definitely no longer “showroom clean,” as I tend to head into the trees fairly aggressively and use the helmet to deflect low-hanging branches.

While the shell has held up, the 360° system is looking a little worse for wear. It has popped out of its mounting points twice, though it snaps right back in. I’m hopeful that in the 2025/26 version, Mammut opts for a slightly more durable plastic for these internal components.

Regardless of those small durability gripes, the Haute Route’s combination of low-profile sizing, light weight, and serious protection credentials makes it the first helmet I reach for every time I head out the door.

Who is the Mammut Haute Route for?

The Mammut Haute Route helmet is literally for everyone hitting the skin track or looking for a low profile helmet for the resort but do not need the ability to close a vent.

New for 2025/26

The Haute Route I tested was the only version available for the 24/25 season. For winter 25/26 Mammut introduced a new model with MIPS and TwiceMe. I will, without a doubt, upgrade to the MIPS version next winter.

Hit this link if you are interested in the Mammut Haute Route in the USA. Hit this link if you are interested in picking up the Mammut Haute Route from our friends at VPO.

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BlackSheep was provided with a free sample of the Mammut Haute Route for this review. This in no way affected our editorial stance. This post also contains affiliate links; if you choose to purchase gear through these links, we may earn a small commission which supports our independent testing at no extra cost to you.