La Sportiva Olympus Mons Pro Mountaineering Boot Review
The La Sportiva Olympus Mons Pro ($1,399) is THE boot for high-altitude or polar expeditions, when temperatures are far below 0 and you’re living on the mountain for weeks at a time. Our tester, six-time Everest summiteer and mountain guide Melissa Arnot Reid, wore the newest “Pro” version (updated in 2025) during a 25-day guiding stint on the West Buttress of Denali during the coldest Alaskan spring on record—temperatures routinely hitting -30 degrees Fahrenheit—and stayed warm and dry throughout. It's the lightest boot in its category by a long shot, and the Boa system makes it the best-fitting version of the Olympus Mons ever. This isn’t the boot you want for technical objectives or anything requiring agility or precision, but for the objectives it was built for, the Oly Mons Pro has no equal.
Stiffness & Support
Warmth
Weight
Durability
Waterproofing
Sustainability
Type
Triple boot
Upper
Synthetic
Crampon compatibility
Automatic
Closure
Boa, Velcro strap
Weight
4 lb. 2.2 oz.
Pros
Cons
La Sportiva Olympus Mons Pro
For this season's top models, see our guide to the Best Mountaineering Boots.
Editor’s note: We're honored to have Melissa Arnot Reid join us as a guest tester for the updated La Sportiva Olympus Mons Pro. Melissa is a mountain guide, six-time Everest summiteer, and the first American woman to summit and descend Everest without supplemental oxygen—one of only about 200 people ever to accomplish the feat. She has summited Mt. Rainier more than 100 times, completed over 20 expeditions in the Himalaya, and co-founded the Juniper Fund to support the families of Sherpa guides lost in the mountains. She has been climbing in various iterations of the Olympus Mons for 18 years, which makes her perspective on this boot about as authoritative as it gets. She tested the current version of the Oly Mons Pro over 25 consecutive days while guiding the West Buttress of Denali.
The La Sportiva Olympus Mons Pro is purpose-built for long expeditions in high-altitude and polar environments, where walking on snow is the name of the game and warmth is the primary factor. Popular on the Seven Summits, it’s primarily a "hike-neering" boot, best for climbs that involve fairly non-technical snow travel and short steps of moderate ice—and long stints of time living in the elements. It’s so insulated that it eliminates any modicum of ground feel or sensitivity, making it challenging for any movement that requires agility. For shorter stints in the alpine or less-than-polar temperatures, a more versatile double boot (like the Scarpa Phantom 6000 or La Sportiva G-Summit) will give you a more performance-oriented connection with snow, rock, and ice. But for the objectives this boot was built for, there's nothing else like it.
The La Sportiva Olympus Mons Pro is a full-shank boot with a 5-millimeter carbon-fiber insole that provides heel-to-toe rigidity, along with a welcome degree of insulation underfoot. I personally don't want any flex in the sole when I'm in mountaineering boots, and the Oly Mons delivers with a brick-like feel underfoot (and I mean that in a good way). Paired with a minimal toe rocker, the boot pairs seamlessly with a wide range of crampon types and models and as such is one of the most crampon-friendly double or triple boots I've worn. This confidence-inspiring connection between boot and crampon is one of my favorite details of the Oly Mons, as I’m almost always wearing the two together.
Given my small stature and feet, all mountaineering boots tend to feel incredibly stiff underfoot. But the Oly Mons adds enough padding that it offers a unique combination of flexibility paired with this rigidity. The inner boot has a thin foam that feels plush around my feet yet held its shape over 25 days of wear without packing out or shifting.
Warmth is what this boot is all about, and that’s why I wanted it on Denali. We had a remarkably cold spring—the coldest in Alaska history—with temperatures ranging from -10 to -30 degrees Fahrenheit on summit day. My feet never felt cold.
The catch with heavily insulated boots is that they are so warm that your feet inevitably sweat. Once wet, it can be nearly impossible to get them warm. The Oly Mons solves this with thin yet efficient insulators—PrimaLoft Aerogel and foam—that simply have a lot less bulk to absorb moisture than the thick, heavy fills you'd find in older expedition boots. I was a little nervous when I saw the boot’s thin insulation, but in practice they kept my feet warm and dry throughout 25 days of living outside on Denali. Science for the win! I also loved that I could remove the liners and let them dry out (and keep them warm in my tent) overnight.
I noticed that my toes stayed particularly warm, which is always a crux in extreme cold. I attribute this to the Aerogel and to the boot's wrap fit, which allows room in the toe box (important for circulation) while maintaining a tighter hold through the heel and ankle. The sole's thickness and deep lugs also do meaningful work here, separating my feet from the snow or cold metal of the crampons underfoot. The only time I had cold feet was while in camp cooking, standing in one spot for hours at a time melting water, but overall I was super impressed with how well the insulation fared.
Before leaving for Denali, I weighed several boot options side by side—a La Sportiva Spantik, an older version of the Olympus Mons with Intuition liners, my ski boots, and the new Oly Mons Pro. The Olympus Mons Pro came in lightest by a meaningful margin at 4 pounds 2.2 ounces for the pair. More importantly, that's how they feel on the foot—the lack of bulk gives them the lightest feel of any double boot I've worn. For comparison, the Scarpa Phantom 8000 comes in at over 6 pounds for the pair, and the Asolo Manaslu 8000 GV at about 5.5 pounds. When you're hauling 90-plus pounds of gear uphill for 20 consecutive days, that kind of difference is felt with every single step.
I did a wild thing and took these boots out of the box, cut the tags, and flew onto the glacier about 10 minutes after first putting them on for the first time. I have a tremendous amount of trust in La Sportiva and my past experiences with Olympus Mons to be able to do this. I’ll admit that I had some slight trepidation as I have experienced quality and durability dips with other brands recently, but I went all in on this one. Good news for me, the boots lived up to my trust.
After 25 days of consistent use on Denali, the Oly Mons’ outer boot has held up flawlessly with minimal visible wear. The liner shows only slight pilling from movement and the occasional Velcro grab, although nothing alarming. The thin foam construction which I mentioned above means there's less material to pack out over time, which I actually think will work in the boot's favor for long-term durability.
The zipper on the gaiter is a huge durability concern among expedition climbers, as well as the Boa toggles. If either fails in the field, you’re SOL. But I was pleased to find that the gaiter zipper felt notably more reliable than previous versions, running straight rather than curved, which makes it less likely to malfunction or snag. I did immediately replace the zipper pulls with longer cord to operate more easily with gloves, which I'd recommend to anyone taking these into serious cold (that’s 100% of users). There's been some discourse from Everest climbers this spring about Boa toggles popping off of these boots, but I handled mine aggressively and had no issues whatsoever. La Sportiva has clearly put real thought into the durability of this updated version, and it shows.
It’s worth noting that the Oly Mons’ outsole is not built for heavy use on rock or other abrasive surfaces. As a boot built for expeditions to the world’s highest peaks and polar ranges, the outsole should spend the vast majority of its time on snow or ice, or shielded from the ground by a crampon. If you find yourself on rock more than snow, first, it’s worth questioning if you’re wearing the right mountaineering boots for the objective. Second, don’t be surprised if the rubber wears away faster than you’d like.
The Oly Mons Pro's gaiter extends almost to the knee, but keep in mind that both the gaiter and zipper are water-resistant rather than fully waterproof. In practice, this should matter very little—if you're wearing this boot in conditions where water appears as a liquid rather than snow or ice, you have bigger problems than wet feet (overheating being the primary).
What's more relevant in this context is moisture management from the inside out. I routinely arrived at camp and hung my sweaty liners in the tent for a few hours, stuffed with dryer sheets or wool base layers to absorb moisture. Each time, they dried sufficiently to put back on in the morning without being frozen stiff. That's a meaningful improvement over my ski boot Intuition liners, which usually stay some version of wet or frozen for the entire trip. For an expedition boot worn over weeks at altitude, the ability to dry the liner each evening is the difference between comfortable and cold, miserable feet.
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Longevity
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Recycled Materials
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PFAS-Free DWR
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PFAS-Free Waterproof Membrane
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Responsible Leather
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Resale and/or Recycling Services
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The outsole on the updated Olympus Mons Pro is noticeably improved from previous versions I've worn. Past iterations tended toward a softer undersole and lugs that didn't inspire a ton of confidence—these are firmer, and that firmness comes with a surprising amount of stickiness on rock. While doing various camp jobs, I wore them around 14,000-foot camp on both rock and snow without crampons and never once had a traction issue. The deep lugs are evenly spaced and more prominent than previous versions, though they do feel overkill for a boot that's primarily worn with crampons rather than relying on lugs for traction. Soft snow balling up on the sole wasn't a problem, which has been an annoyance with other boots in this category.
As mentioned above, the boot’s minimal toe rocker is the outsole detail I appreciate most. It allows for a snug, secure fit with a wide variety of crampon types and models. A solid connection between crampon and boot matters a great deal when you’re living on snow, and the Oly Mons stands out to me in this respect.
Crampon Compatibility
The Oly Mons Pro's minimal toe rocker and well-designed heel and toe welt make it one of the most crampon-friendly double boots I've worn. I paired the boots with Petzl Vasak crampons and also tested my partner's Black Diamond Contacts, which tend to be considerably more finicky. Both fit securely without any gap at the toe from the slight rocker. The back lip and front crampon shelf made achieving a snug, step-in fit straightforward with both automatic and strap-on crampons. For a boot that's almost always worn with crampons, this reliable connection is one of its most important qualities.
Boa System
The Boa system is one of the Oly Mons Pro's standout features, and it transforms what has traditionally been one of the most frustrating aspects of double boot use—dialing in the fit. The liner wrap is tightened with a solid Velcro strap, while the exterior Boa allows for on-the-fly adjustments throughout the day without removing gloves or stopping to fiddle with laces. I took advantage of this more than I expected, tightening the fit for technical sections and loosening it slightly during long uphill slogs to keep blood flowing. The result is one of the best-fitting 8,000-meter boots I've worn, which is a statement I don't make lightly after 18 years in various versions of the Olympus Mons.
Gaiter
The integrated gaiter extends almost to the knee, providing excellent coverage for the deep snow conditions you'd encounter on a Denali expedition or Himalayan objective. The zipper runs straight rather than curved like previous versions, which makes it significantly less prone to snagging or malfunctioning—a critical durability improvement for a component that gets heavy use. I immediately replaced the zipper pulls with longer cord to make them operable with gloves, which I'd recommend to anyone taking these into serious cold. The gaiter closure is water-resistant rather than waterproof, but in the environments this boot is designed for, that has little consequence.
Removable Liners
The Oly Mons Pro's removable inner boot is one of its most practically important features during a long expedition. Each evening at camp, I pulled the liners out and hung them in the tent stuffed with dryer sheets and wool base layers, and they dried sufficiently overnight to comfortably put back on in the morning. The liner’s thin foam construction dries faster than the thicker liners I've used in other double boots—notably faster than the Intuition liners in my older Oly Mons. For anyone heading into an extended cold-weather expedition, the ability to dry your liners each night is a necessity, not a luxury.
My main grievance with La Sportiva is their inconsistent sizing across models. I wear anything from a 38 to 40 in their various shoes and boots, and a redesign can shift things by a full size in either direction. For the Olympus Mons Pro, I sized up to a 40, knowing I wanted extra room for warmth rather than a tight technical fit. In hindsight, I think I would have been happier in a 39.5 or even a 39. The redesigned liner and outer boot have reduced overall volume significantly compared to my previous pair, and on descents I noticed a slight feeling of sliding forward in the outer boot. This roominess wasn’t enough to impact performance, but it was noticeable.
That said, the Boa system goes a long way toward compensating for fit variability. After 18 years of climbing in various versions of the Olympus Mons, this is the best-fitting iteration I've worn, and the Boa is the main reason why. It allows for real-time adjustments throughout the day without stopping or removing gloves. I found myself using it more than I expected—tightening the forefoot for technical sections, loosening it slightly on cold morning slogs to keep blood flowing. Double boots always carry a certain "swim" feel, but with the Boa I could ratchet that down enough to feel precise foot placements on firmer ice.
La Sportiva G-Summit ($929): For More Technical Terrain
While the Olympus Mons Pro is for “hike-neering” expeditions to the world's coldest mountains, its expedition-level insulation and stiff, heavily cushioned construction make it far too much boot for climbers tackling more technical objectives. La Sportiva’s G-Summit offers more precision and agility without sacrificing too much warmth, with a unique construction that allows you to use the removable liner and thermal insole when conditions ask for more insulation, and leave it behind when the terrain demands a closer fit. If you’re on expeditions that have you on snow and at altitude for weeks at a time, you’ll be more comfortable in the Oly Mons, but for fast-and-light climbing on 6000-meter peaks or extra cold days of cragging, the G-Summit is the more practical choice.
Headed on a high-altitude or polar expedition? This is the boot you want on your feet. No other model matches the Oly Mons Pro’s warmth-to-weight ratio, which our tester approved for conditions as low as -30 (or lower). And with an easily tunable Boa dial, it’s the best-fitting Oly Mons yet.
Stiffness & Support
Warmth
Weight
Durability
Waterproofing
Sustainability
For fast-moving alpinists tackling technical objectives, now you can have your cake and eat it too. The full-shank G-Tech offers performance on everything from vertical ice to long snow slogs, and it does so at a ridiculously low weight.
Stiffness & Support
Warmth
Weight
Durability
Waterproofing
Sustainability
The Alpine Expert II GTX is a leather boot built for the broad middle ground of Lower 48 mountaineering—snow travel, moderate ice, and third-class rock scrambling. It's heavier than more modern alternatives and won't satisfy on technical ice, but few boots at this price match its longevity or versatility across varied objectives.
Stiffness & Support
Warmth
Weight
Durability
Waterproofing
Sustainability
Is the Olympus Mons Pro for You?
The La Sportiva Olympus Mons Pro is for the mountaineer heading into the world's coldest and most demanding environments—Denali, the Himalayan giants, polar expeditions—where warmth is the primary factor. There are a few other contenders in this category from brands like Scarpa and Asolo, but none are as lightweight as the Oly Mons, which matters on long expeditions where every ounce compounds over weeks of use. Its insulation and bulk is overkill for technical climbing, lower-elevation expeditions, or shorter trips where you’re not living for weeks in the elements, or for any objective where agility and ground feel are important. But for the objectives this boot was built for, there is simply nothing else like it.
Go for it if you're heading out on expedition to extreme altitude or polar environments where warmth is paramount and you don’t plan on climbing particularly technical terrain.
Pass on it if your objectives involve significant technical climbing or don't demand expedition-level insulation—a lighter, more precise double boot will serve you better.
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