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La Sportiva G2 SM Mountaineering Boot

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    14 Reviews


    G2 SM Mountaineering Boot

    Designed in collaboration with alpinist Simone Moro, the La Sportiva G2 SM Men's Mountaineering Boot is built to withstand the brutally cold winter ascents that Moro is known for. Intended for merciless Himalayan or Denali climbs, the boot consists of a water- and wear-resistant Cordura upper with an air-injected rubber rand for added protection against alpine rock and ice. The gaiter boasts a water-resistant laminate, complete with taped seams and water-repellent zip closure, which is designed to safeguard you from moisture throughout the course of your ascent.

    As mentioned previously, the boot is made with a water-resistant Cordura, which is reinforced by Lorica synthetic leather and an additional, water-resistant Antiacqua coating. And while one might be lead to believe that the G2's myriad of layers would create a marshmallow effect, the boot in fact offers a low-bulk fit—without skimping on performance. For insulation, the G2 utilizes thick perforated felt, low-density PE foam, and a thermo-reflective aluminum to ensure reliable warmth. The inner boot is secured by a solid, dual Boa closure system that can be cinched down tight, without having to expose your bare hands to the biting cold. Additionally, the 6mm PE and EVA foam inner boot offers additional warmth, and can be removed and dried at camp, or kept warm in a sleeping bag until your still-dark alpine start. Sportiva equipped the G2 with a Vibram Matterhorn sole and Impact Brake System to assure solid traction once the crampons come off. And, the stiff 6mm polyurethane midsole (with toe and heel welts) allow the G2 to be worn with step-in crampons to offer quick and secure attachments.

    • Mountaineering boot is one of the lightest, warmest in its class
    • Cordura gaiter with air-injected rubber for added weather resistance
    • Outer boot boasts felt, foam, and reflective aluminum for insulation
    • Removable inner boot can be worn inside sleeping bags to keep warm
    • Vibram Matterhorn sole with Impact Brake System for solid traction
    • Compatible with step-in crampons
    • One of the first mountain boots built with Boa closure for glove-friendly closure
    • Item #LSP008U

    Tech Specs

    Upper Material
    [outer boot] Cordura, Lorica (synthetic leather), [gaiter] Cordura, rubber, [inner bootie] PE foam, EVA foam, Cordura
    taped seams, membrane
    perforated felt, low-density PE foam, thermo-reflective aluminum
    Removable Liner
    [outer boot] Boa, [gaiter] zipper, [inner bootie] hook and loop
    3mm Honeycomb Tech insulating carbon
    Vibram Matterhorn, Impact Brake System
    super-gaiter boot
    Crampon Compatibility
    Claimed Weight
    2 lb 4 oz
    Recommended Use
    alpine & expedition
    Manufacturer Warranty
    1 year

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Good boots, but terrible liners

    • Familiarity: I returned this product before using it
    • Fit: Runs small
    • Size Bought: 44
    • Height: 5'7"
    • Weight: 150lbs

    The liners are horrible and should be re-designed. They put a nasty pressure spot at the top of the foot on the ankle joint. Hurt just walking around inside. I did try them with Scarpa 6000 liners and they would be great boots with a better liner. Ultimately opted to keep the Mammut Nordwands instead for the better integrated gaiter (was a toss up between that and the La Sportiva G2s with Scarpa liners).

    They got me to Mt Washington summit!

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: 45
    • Height: 5'10"
    • Weight: 185lbs

    They were awesome hiking in the White mountains! I used them once on Madison/Adams attempt, another time successful Madison summit, and two successful Washington summits. They do get warm so you can pretty much strip down at lower altitudes lol but they are a 6k boot. I used them because I was solo hiking and it can get really cold standing around in the Whites in an emergency situation.

    Anyways, the double BOA really locks foot down. I did notice the pinch while walking up steps at my house but it wasn't that bad in the sense that I really had to push down a certain way for it to be painful. I did not notice at all while hiking nor did I have anytype of irritation/marks post hike. They worked well with Petzl Sarken crampon with a slight hammering of toe bail, otherwise a perfect/tight fit. Finally, even with a lot of sweat the liners did not smell. I am guessing they eventually will, as een wool will, but considering I sweat a lot in them they did very well.

    Highly recommend... but Wait for a SALE!

    Oh yeah and I wear a size 11 in salomon, Inov8 and Nikes, sometimes I size down to 10.5 ( some Merrells) but it is rare. I wear a 43 in la sportiva tarantulace and a 44 in Boulder x with just enough room for comfortable hiking. I have a really wide foot with narrow heel. My heel slips in just about everything and super wide across toe knuckles and my instep is not highest, just wide... I ended up going with a size 45 so I had plenty of room for toes. I wore a silk sock liner and crew socks. I also tried smartwool thin phd ski sock with thicker hiking sock over it... couldn't tell much of a different to be honest... Can't stress how awesome the BOA is in getting heel lift to a minimum with sweaty feet. Superfeet makes it worse in my experience...

    Well that's about it and then some... wrote a small essay lol

    what i would give to like these boots

    • Familiarity: I've put it through the wringer
    • Fit: Runs large

    light double boots. thats pretty much the only positive to these high altitude over priced boots. after a complete ice climbing season in south central ak, and the central alaska range. i am utterly disappointed. especially the time i was 6 miles out on a approach and stepped in over the top of the toe box deep water. 3-4"inches and felt the water literally pore into the boot before the climb. that was after spending weeks trying to get the heel lift manageable to actually climb ice. rubber rand starting peeling off one month into owning them. after owning the spantiks this feel like a step backward. yes they have boa, they also have a nice pinch point right at the top of the foot. save your time and money and don't even bother looking at this boots as a possibility. stick with the spantiks or get the phantom 6000, thats what i will be trying.

    Truly Amazing

    • Familiarity: I've put it through the wringer
    • Fit: True to size

    I have very wide, high volume, foot with a high instep. In street shoes, I wear a 10 EEEE. As a result, climbing has often been painful. Until now. The boa lacing system is amazing. Size 45 fits me perfectly. Until now, heavy hard shell plastic boots, or boots that were too narrow, were all I could wear. If you have wide feet, you owe it to yourself to try a pair of these.

    Follow up to my earlier review. Other reviews have noted that they suffer from a “pinch point” on top of their upper insteps. For reference, I have freakishly wide (EEEE), high volume feet, with an abnomaly high instep. I wear light Smartwool liners, followed by Sealskinz waterproof merino/Goretex socks, with a final layer of Warrior High Performance alpaca socks. With that combination, I have been comfortable, warm, and dry at 14,000 feet, -36 F, with winds 30 to 60 mph. I would not hesitate to summit Denali in them. I love that the inner boots are DYI heat moldable, and I purchased an extra pair and molded them to my feet according to the directions at La Sportiva web site. I have not had problems with the rubber rand peeling, but that is common problem with super gaiter boots like this, so I applied a heavy coat of seam sealer on the edge of the rand, and i clean the boots and reseal after several days of use. If you watch the movie, “Meru,” there is a scene in which Renan Ozturk applies seam sealer to the rubber rand of his Spantiks in this manner.


    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: Runs small

    Super warm and light weight for a mountaineering boot. He hasn't had much of a chance to test them out in truly cold weather, but has been breaking them in around the Wasatch. He had to size up in these.

    G2 vs Nepal

    • Size Bought: 44.0

    I wear size 44 (cubes without the extra tongue padding) in both. They fit very similarly, but the G2 SM's appear to be slightly wider in the toebox but you can adjust that to some extent with the lower BOA control. For reference, I have a wide foot, short toes and high arch. I seem to fit the La Sportiva Nepal last but not the Trango last (too narrow & long). My street shoes are typically 10-1/2M or 10EE.

    Now on to my preliminary impressions of the G2 SM's: to quote my step-daughter when she was younger, OMG, Becky, these things are light! These things are definitely coming ice climbing with me this winter. I will save them for colder conditions and/or multi-day stuff where putting the liners in my sleeping bag matters. Double boot stuff & waterfall ice climbing, basically.

    Hola,, las probé con una escalada y senderos con muchas piedras de 5000 mts. la verdad que se portaron como los dioses, muy ligera y cómodas, no pase nada de frió, siempre usándolas con medias muy finas, no cometan el error de usar medias gruesas o muy calientes,, hasta ahora me resultaron muy buenas... recomiendo

    Wish it had a different liner

    • Familiarity: I returned this product before using it
    • Size Bought: 42
    • Height: 5'4"
    • Weight: 130lbs

    I have wear a size 7.5 US(M) street shoe, and have a 2E/3E foot depending on how much I've been on them. I went up 1.5 sizes and got the 42, equivalent to a US 9, and the room in the toe box was perfect, and could dial in the fit perfectly to allow for some heel lift, or lock my heel down completely. The BOA system was nice to use. Having the option to leave the forefoot completely lose but tightening the ankle keeps your foot snug in the boot, but gives as much room as possible for a someone with a wider foot.

    They are definitely warm. I have terrible circulation in my hands and feet. The slightest breeze at 70 degrees without socks on can make the blood stop flowing to my feet, to the point that they turn "white". But within 1 minute, my feet were sweating in these boots.

    I only wish these boots had a different liner, or that Scarpa sold theirs separately.

    As others have mentioned, the liner digs right into your foot where it bends and meets your leg. And despite there being Velcro across the top of the liner, it doesn't tighten easily without folding weirdly. However, I have a Phantom 6000 with me, the older model with the T-Zip and liner with the bare foam on the inside, and the boots felt perfect with the Phantom liner inside the G2 boot.

    amazing boots!

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: 43.5
    • Height: 5'6"
    • Weight: 141lbs

    i use the same number (43.5) in my nepal cube and fits me perfect, i used them in vallecitos (argentina) and in North Woodstock N.H. and this boots are really warm and very light, i'm really glad with these boots

    amazing boots!

    So I’m torn between these and the Spantiks, but the more I read about warmth, lightness, durability…the G2’s seem to get more nods.

    I have a pair of the Trango S Evo’s at 42.5 (I wear 9.5US most often in LaSportiva) and they are just a shy tight. I read that the G2’s give a lot more room in the toe box than any other of LaSpo’s mountaineering boots so I’m concerned about proper sizing along with the proper socks. I also have a set of Scarpa Mount Blanc Pro’s that I got in 43 and those are stellar on fit and use, but not warm enough for this upcoming trip.

    At present, my need is for a warm mountaineering boot for multi day trips here in the Northeast (Baxter in February for instance). The goal being to hit up the Cascades, Denali and the like down the road. But for now, need a bomber multiway mountaineering boot.

    Any help or direction is appreciated!




    These boots are amazing, summited Amadablam 6,856 meters without the feeling of cold feet. Easy to tighten the laces, undo or loosen them too, second boot kept on when it was real cold. Very sturdy an great for rock climbing.


    Super Stoked!

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: 46.5
    • Height: 6'4"
    • Weight: 180lbs

    Wear a 46.5 in the Nepal EVO. Same size ordered as the G2. So far, I'm impressed with the fit and finish. The BOA system is a great step forward, but I'm also cautious to see how they hold up. I'll be using my G2's on Cayambe, and a few other Ecuador Volcanoes. They're certainly amazing warm. They also climb really well, so these will be excellent for cold days ice climbing! I'll update my review after I get some use out of them in the REAL cold in the Adirondacks.


    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: 42
    • Height: 5'7"
    • Weight: 170lbs

    I am replacing a pair of original (first gen) Nepali Extremes with these. It was hard to decide because La Sportiva markets these as high altitude mountaineering boots, so I was concerned they may be over kill for ice climbing in Southern Colorado and too much like the Olympus Mons versus the Batura. I will update my review after some vertical with these bad boys but so far I think they are perfect. They probably are a bit warm if you are used to Trangos and climbing while the ice is running. I like to climb early morning or at night when the temps are colder. I think these will be awesome. The double boots is awesome, the BOA is a welcome leap forward, and so far I feel like they are lighter then my original Nepalis. As to how they will climb, I imagine quite well but time will tell. They are wide, but for %99.9 of my winter climbing that really doesn't matter. I am most concerned with stiffness, comfort, and warmth. I think La Sportiva nailed it on all fronts. As for being too warm, after coming from a pair of slightly too small Nepalis and chronic cold feet I will gladly take a sock change mid day because my feet get hot in the afternoon. My only concern is that the gaiter will not hold up. I would hate to have zipper failure prematurely end what should be a long lasting boot. I hope with these boots I will never have cold feet again! As for the weird ankle pinch, I don't think it is a deal breaker, is probably the result of the indendent lacing system, and will probably soften considerable with wear.

    Boa failure, ankle pinch point

    • Familiarity: I returned this product before using it
    • Fit: True to size
    • Size Bought: US 11 Mens
    • Height: 5'10"
    • Weight: 170lbs

    I just received a pair of G2 SM's - eventually intended for Denali, but with some adventures beforehand. There's a lot of pros, but a couple of cons too that I wanted to share and perhaps get thoughts on:
    - I should first mention that didn't have the size I needed, so I purchased elsewhere online. Out of the box (although I have a suspicion they might have been 'tested' by someone else previously), one of the 4 boas on my pair was a little tricky to push in - looked like it was turning off-axis when trying to tighten, and also skipping as though some internal teeth had been rounded down or something. After continued attempts to resolve it, I guess I rounded them down more, and that boa wouldn't tighten at all.
    - when I keep my foot flat on the ground, and pivot forward at my ankle, I can feel the boot dig into the front of ankle. I suspect this is because one boa secures the boot across the top of the foot, while the other secures around the ankle, however there is no support bridging these two sections, so the boot folds in at the junction of them, and into the front of your ankle. That's my best effort at explaining it anyway - anyone notice a similar issue?

    I had the same problem... ordered 2 pair and walked around house for days....I have had same problem with other sportiva except for silver bullets and batura 2.0, both of which don't pinch the top ankle hinge

    Hey Surly,

    Any chance you could share more details on this fix? I have these boots as well and love them but I have noticed the pressure over the instep. Any further details/pictures you can share would be awesome!

    I have to say that I finally got the heel lift problem solved with some super feet and a heat molding, but this ankle pinch thing is driving me nuts. Have tried many different settings of tightness and I literally have fluid build up in my ankle by the end of the weekend. This sucks, especially since I love everything else about these boots. This is a definite design flaw with the closure system, and I wish there was some kind of fix, because I am not going to go to a different boot, but it would make hiking so much better if this was not a problem.

    It's the new boot in town

    • Familiarity: I've used it several times
    • Fit: True to size
    • Height: 5'7"
    • Weight: 190lbs

    So many people I have spoken to are ordering the G2 SM's.

    I got mine last December as a gift to myself. Thank god for not purchasing the Spantiks.

    The majority of guides I see are in Spantiks and they are chewed to hell. Will these G2's hold up to the rigors that someone like that puts them through? That will be an interesting match up. I have had plenty of people check out the boots and everyone is impressed with what La Sportiva has come up with. Many of the guides I have spoken to have them on order. I want to see how well they do compared to the spantiks and Baruntse boots for durability.

    I love them. The Boa system is just too easy to use. The inner boot is an upgrade from the Spantiks and the built in gaiters are super sweet too.

    I used them in March trying to get up to Muir to drop off Easter candy to my buddies who were up there. They matched up really well with snowshoes and kept my feet plenty warm while I tried to find my way through the whiteout conditions.

    I have heard La Sportiva finally got replacement Boa Laces in stock. I am getting a spare wire or two to take with me just incase.
    Though, I have heard really good things about Boas durability in recent years.