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La Sportiva Nucleo High II GTX Backpacking Boots Review

La Sportiva Nucleo High II GTX Backpacking Boot Review

The La Sportiva Nucleo High II GTX boots are hybrid leather and textile backpacking boots that weigh less than many mid hiking boots but have deep lugs, a large toe kick, and a reinforced midsole that offers better foot protection. The boots have plenty of arch support and a lacing system designed for enhanced ankle flexibility that’s perfect for nuanced hiking footwork, giving the boots a sporty feel despite their leather construction. They also have an amazingly grippy Vibram sole, a characteristic of all Sportiva boots and trail runners, that provides extra assurance when peakbagging and scrambling over rock ledges. Wide sizes are also available.

Specs at a Glance

  • Best Use: Backpacking, peakbagging
  • Weight per pair: 2 lb 1 oz / 936 g
  • Gender: Men’s, Women’s
  • Waterproof: Gore-Tex Surround
  • Upper: Nubuck leather and softshell in high flex areas
  • Footwear Height: Over the ankle
  • Footwear Closure: Lace up
  • Midsole: Compression-molded EVA
  • Support: 2.5 mm Polypropylene Stiffener
  • Outsole: Vibram Nano XS-Trek rubber compound
  • Can Be Resoled: Yes
  • Wide Sizes: Yes

I never thought I’d be wearing leather hiking boots again for three-season hiking but nagging metatarsal pain (See Hikers Guide to Metatarsal Pain) has forced me out of trail runners and back into stiffer hiking boots with better forefoot and midsole protection. Enter the La Sportiva the Nucleo High II GTX backpacking boot, which is as lightweight as many mid hiking boots, with the sticky soles and agility that La Sportiva is known for.

While the Nucleo High II GTX is available in wide sizes for men and women, the regular width boots are much more nimble and narrow than other backpacking or mid boots from the likes of Lowa, Oboz, Salomon, Asolo, or Vasque. La Sportiva is known for its approach shoes, which combine the characteristics of climbing shoes and hiking boots, and you can see that DNA shining through in the Nucleo High II GTX boots.

Leather and Textile uppers

While the Nucleo High II GTX is made with a combination of softer nubuck leather and a ballistic textile, it’s important to break them in before you use them on an extended trip. This took me 10 miles, which is much less than the 50 miles normally recommended for an all-leather leather backpacking boot like an Asolo or a Danner. While the Nucleo’s leather is soft out of the box, the break-in process helps loosen the ankles and upper half of the boots, so they’re more flexible and comfortable to wear on uneven and rocky terrain.

The tongue is gusseted to prevent water from entering the boot
The tongue is gusseted to prevent water from entering the boot

While the uppers are in part leather, the gusseted tongue, side panels, and ankle areas are covered with textile, allowing the boots to dry surprisingly fast if they wet get inside. I had occasion to test this over the weekend when I stepped on a wobbly river rock while fly fishing/backpacking and landed on my ass in the river with my boots completely submerged. Much to my surprise the inside and exterior of my boots were nearly dry the next morning, something that I attribute to the hybrid leather/textile construction of the boots. In comparison, this is a process that has taken days in other leather hiking boots that I’ve owned in the past, making hiking in them absolute hell.


The Nucleo High II GTX has a Vibram sole with aggressive legs and a mild rocker. There’s a heel counter to prevent pronation and an exaggerated toe kick to protect your toes which is important if you hike in mountainous terrain. The boots also feature La Sportiva’s impact brake system where the lugs are angled so more of them stay in contact with the ground for maximum impact absorption and braking power, especially on higher angle terrain. My La Sportiva Trail Runners (Ultra Raptors) use the same braking system, so I’m quite used to how they feel.

The boots have a sticky rubber Vibram insole that provides great traction.
The boots have a sticky rubber Vibram outsole that provides great traction.

The midsoles are compression-molded EVA with a polypropylene stiffener built on what La Sportiva calls their Tempo last. This is wider than the last they use in their trail runners, resulting in a more stable platform that helps spread out impact forces. The result is firm arch and heel protection with very moderate forefoot flex, providing a rather substantial reduction in the amount of metatarsal pain I feel when hiking.

Laces and Footbed

The laces that come with the Nucleo High II GTX suck. They’re thin, slip easily, and are prone to breaking. I replaced mine with some Oboz laces I had lying around but plan to replace them with Technora Toughlaces when I get a chance. I use them on my winter hiking boots and they are indestructible.

The Ortholite footbeds that come in all La Sportiva footwear also offer very little support and I replaced them with Oboz O Fit Plus footbeds, which have a high arch, an anti-pronation cup in the heal, and gel pads under the metatarsals and heel. These Oboz insoles are even stiffer than SuperFeet Green Insoles and provide much more cushioning and support, especially in the forefoot area. I always replace the insoles in all of my shoes with third-party insoles which are usually thicker and much more supportive than those that ship in boots, with the exception of Oboz boots and trail shoes.

The ankles are covered in softshell for enhanced flexibility
The ankles are covered in softshell for enhanced flexibility


La Sportiva chose Gore-Tex Surround waterproofing for the Nucleo High II GTX, which allows water vapor to escape through the sole, below the foot, working in conjunction with porous textiles in the uppers. The idea is to surround the foot with multiple avenues for moisture to escape in order to keep your feet and socks drier.

Admittedly, I’m a Gore-tex cynic, but I’ve been pleasantly surprised by the breathability of these boots. They’re not too hot to wear in warm weather and my wool socks stay dry, even when I’m wearing long pants that cover my lower legs and ankles.

As for waterproofing, no worries there. I’ve crossed shallow streams, hiked through mud and muck, and bushwhacked off-trail in these boots and stayed high and dry.

Comparison Table

Make / ModelWeightUppersMen'sWomens
La Sportiva Nucleo High II GTX2 lbs 1 ozNubuck LeatherMen'sWomen's
KEEN Targhee III Waterproof2 lbs 2.8 ozNubuck LeatherMen'sWomen's
Merrell Moab 2 Mid Waterproof2 lbs 4 ozSuede Leather, MeshMen'sWomen's
HOKA ONE ONE Sky Kaha Gore-tex2 lbs 4.4 ozLeatherMen'sWomen's
Oboz Sawtooth II Mid Waterproof2 lbs 6 ozNubuck, MeshMen'sWomen's
Lowa Renegade GTX2 lbs 7 ozNubuck, NylonMen'sWomen's
Salomon Quest 4 Gore-Tex2 lbs 14.4 ozLeather, TextileMen'sWomen's


If you’re looking for very supportive but lightweight hiking boots, I’d definitely recommend giving the La Sportiva Nucleo High II GTX  a try. Weightwise, they compare very favorably against the burlier class of mid hiking boots listed above, with stiffer midsoles and leather uppers, despite having a slightly higher ankle cuff. If you need a hiking boot that offers more midsole protection and stability and that is optimized for mountainous terrain, you’ll be hard-pressed to find a better or lighter weight boot than the La Sportiva Nucleo High II GTX. These boots can also be resoled, which I consider a big win, from a sustainability standpoint, and because I hate shopping for new boots and shoes.

La Sportiva Nucleo High II GTX Boots

Foot Protecton
Water Resistence

Lightweight but Rugged

If you need a hiking boot that offers more midsole protection and stability and that is optimized for mountainous terrain, you'll be hard-pressed to find a better or lighter weight boot than the La Sportiva Nucleo High II GTX.

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  1. What size did you go with, as compared to your Ultra Raptors? Thanks.

  2. Having done two miserable hikes in new Lowa Renegades (my first pair was great) – the new ones had no. Support and crammed my toes.

    I ordered (through your links) the La Sportiva boots and Obos soles. A few miles in the Middlesex Fells this morning and I really like these boots.

    Thanks for the great review.

    • Glad they’re working for you. They’ve saved my summer I think because they’re stiff enough to protect my metatarsals.

      • I’m losing my mind researching what boots I should even attempt to buy. I’ve been wearing Oboz for years. But I’ve been doing tons of bushwhacking and off trail backpacking recently and my Oboz aren’t quite enough boot. I almost pulled the trigger on a pair of Renegades but it seems Lowa has changed something about them – and as Bill said above, it’s not for the better. However, these boots are widely well-reviewed… and if I put Oboz insoles inside of them, maybe – could I be getting the best of bost worlds?
        I apologize, I don’t know if you could possibly answer this question, and I also apologize for my obvious desperation.
        Should’ve stopped researching months ago and avoided this analysis paralysis, but here I am.

        Thank you so much for all the work you do here – it’s been invaluable since I moved to the Southern ADKs a few yrs back.

        • Unfortunately, Oboz has also changed some of their boots and the insoles don’t compensate. My advice is to order 10 boots from REI, wear them, and return the ones that don’t work, since they will take back boots even if they are worn within one year, if you are a member. “it is the way.”

  3. Thank you so much for recommending the footbed and laces. I’m going to order them.

    Thanks for the great reviews! I love your reviews.

    Tram N.

  4. Will the Technora Toughlaces fit through the Nucleo eyelets?

  5. Thanks for the thorough review as I am considering these.
    Are you positive that this boot can be resoled?
    According to the La Sportiva FAQ located at: under Care Maintenance and Warranty, none of the Hiking or Approach boots can be resoled.

    Please let us know if you have more positive news.


  6. A couple of years back, I read one of your positive reviews on Ultra Raptors (lows), purchased a pair, and have loved hiking in them. However, like you, I am having foot issues and have been researching boots after many years of hiking in trail runners. I’ve tried on Ultra Raptor mids, Nucleos, Salomon Quest 4s, and Salomon X Ultra 4 mids. For me, the Nucleos were the clear winner for comfort and fit (I have wide feet).

    However, after reading a number of user reviews, there does seem to be a theme where the soft web-patterned rubber panel on the inner side of the boot breaks down and wondered about your experience?

    I’m also curious if you could compare them to the Ultra Raptor mids and whether you’ve done a recent review on the newer Salomon Quest 4s?

    • First off – I no longer have foot issues because I’ve found orthotics that work regardless of the boots or shoes I wear. That may be worth considering, especially if you want to stay in trail runners. I’ve never heard of that breakdown, but I don’t put a whole lot of trust in user reviews because you can never tell what batch of shoes from the manufacturer or retailer they refer too and whether its the same as yours, and for other reasons as well. In this case, I’m not really sure whether you can really compare the two shoes – one’s a soft-soled trailrunner and one’s a boot with a harder sole. It’s be like trying to compare a cheetah to an elephant.

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