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  • La Sportiva - Synthesis Mid GTX Hiking Boot - Men's - Grey/Green

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  • La Sportiva - Synthesis Mid GTX Hiking Boot - Men's - Grey/Green

La Sportiva Synthesis Mid GTX Hiking Boot - Men's

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    • 40.5
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    • 41.5
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    • 43.5
    • 45.0
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    • 46.5

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    • Grey/Green

    10 Reviews


    Surround your foot with better breathability and waterproof protection.

    The La Sportiva Men's Synthesis Mid GTX Hiking Boot feels surprisingly breathable for a shoe equipped with waterproof protection. That's because Gore-Tex's latest-and-greatest Surround technology allows 360-degree breathability. Compared to previous waterproof, breathable membranes that only cover the shoe's upper, Surround technology wraps a membrane around the upper and sole. You'd think this would decrease the shoe's overall breathability, but La Sportive fused a sole with mesh inserts that enhance the shoe's breathability while still providing a truly waterproof experience.

    The Synthesis also features a well-ventilated AirMesh upper with Nano-Cell technology for better support. STB technology unifies the midsole to the upper for a longer lasting performance, and the PU leather toe protects your foot from protruding rocks. Underfoot, the Synthesis uses a cushy compression-molded EVA midsole with cradling TPU inserts that keep your foot prime for miles. A shoe this good deserves the best sole, which is why La Sportiva used Vibram's superlight Nano rubber, and there's also an Impact Brake System for an improved downhill performance. 

    • Gore-Tex Surround
    • AirMesh upper with Nano-Cell direct injection
    • PU leather toe rock protection
    • STB technology
    • Compression molded EVA midsole with TPU inserts
    • Vibram Nano rubber sole with Impact Brake System
    • Item #LSP007H

    Tech Specs

    Upper Material
    AirMesh, Nano-Cell direct injection, PU leather
    Gore-Tex Surround
    compression-molded EVA, TPU insert
    Vibram Nano, Impact Brake System
    Claimed Weight
    14.6 oz
    Recommended Use
    hiking, ultralight backpacking, speed hiking
    Manufacturer Warranty
    1 year

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Almost Gore-tex

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

    These mid boots are great day hikers! I've used these down in Moab walking some creek beds and they have worked ok. The Gore-tex in this shoe is not your full Goretex that you see in normal boots though. You will get wet a lot faster! But they did work great splashing through a bit of puddles. They are comfy and lightweight. I like the mid height shoes to help with a little ankle stability over a standard height shoe. Note that La Sportiva is a bit smaller so size up a half size at least in these. I have a 10 and should have went with a 10.5.

    I took off that star for the waterproofness. Otherwise they are great if you do not plan on getting too wet.

    Almost Gore-tex

    Good while they lasted

      I bought these for a 10 week backpacking trip in Patagonia. They were fantastic for the first two weeks but then they quickly fell apart. They were punctured by calafate thorns and lost their waterproofness. The sole detached from the front of the shoes and the fabric on the heel wore-out. They were completely blown-out when I got back stateside. That being said, I was hiking off-trail with an overloaded pack . If I was sticking to trails with an ultralight setup, perhaps they would have lasted longer. Because I was using them beyond their intended purpose, I will give an extra star (3)

      Awesome Shoes, Run Small

      • Familiarity: I've used it several times
      • Fit: Runs small

      A customer of mine purchased these shoes in a 45.5(US 12) and had to exchange them for a 46.0(US 12.5). He spent a week backpacking a section of the Appalachian Trail starting at Springer Mountain. He said the boots were awesome. They kept his feet cool and dry through two days of nonstop rain, and provided excellent traction on muddy trails and slippery rocks.

      Get in touch with me if you need help finding great hiking shoes and other gear for your next hiking/camping/backpacking adventure!

      Synthesis - Awesome, but runs small

      • Familiarity: I've used it several times
      • Fit: Runs small
      • Size Bought: 45 EU

      Per the sizing chart, I should wear a 43.5 or 44 EU. However, after some trial and error, I settled on a size 45 to have enough width in the toe box and the proper length. I usually wear a 10.5 or 11 US and a 45 EU equates to a size 11.5 US. So be aware, and try a few different sizes on until you find what works/fits best for you.
      Aside from that, they run a little warm, but the gore tex surround is super legit, keeping your feet dry in watery conditions plus allows some breathability. My favorite feature is the Vibram Break sole... game changer in so many conditions, from snow, to mud, sandy trail and rocky trails. The boot is lightweight and rugged enough. It probably isn't going to last for 5 aggressive hiking seasons, but that's not necessarily what it's designed for. For a gore tex, light weight hiker, this boot is hard to beat!

      Great support but close fit

      • Familiarity: I've used it several times
      • Fit: Runs small
      • Size Bought: 45.5 or size 12

      I have always worn a size 12. When ordering I had to order a size 45.5. These boots fit like a glove with lightweight socks but I can not wear them with a heavier weight sock for winter use. If I had to order again I would order a 46. As far as comfort and support, they are unmatched with any other boot I have used. The workmanship in these boots is superb. I never used this type of lacing system before and it works great.

      Backcountry is great to deal with. If you choose to order these boots wait for a sale and order two pair, your size plus a half size up. Return the pair that doesn't quite cut it.


      • Familiarity: I've used it several times
      • Fit: True to size

      I purchased this product with the hopes of dropping weight on my feet. This supposedly waterproof boot is far from. On a recent 31 mile hike in the Northern Cascade Mountain Range these boots soaked through almost immediately and without exposing them directly to a water source. I was unable to get these boots dry for the rest of the trip, which was not ideal.

      Construction and quality was okay, not great. Visibly you can tell the quality is not top notch while looking at the boot. The toe piece of both of my boots started to peel back after 31 miles, which is not ideal. The upper tongue also started to wear out due to the quick laces after only 31 miles. I was told that this is normal wear and tear, which is concerning to say the least.

      Fit was true to size and they were decently comfortable. The sole is very flexible and you notice it on your feet if you're on anything other than flat ground.

      Overall the product had great potential, but failed to meet the needs of a boot I would be using in the PNW.


      • Familiarity: I've used it several times
      • Fit: True to size
      • Size Bought: 41

      Are you kidding me?! That was my reaction when I got home today after putting in miles in 103 degree heat. Pulled the boots off and my socks were dry as a bone! NO SWEAT whatsoever, this with a Gore-Tex liner? In case you are wondering, I wear the Smartwool PhD Run Elite socks. I have yet to test out water permeability, but that will come soon enough here in Portland. Now to the comfort, UNBELIEVABLY COMFORTABLE! In fact, the most comfortable boot I have ever had the pleasure of putting on my feet. And they were comfortable immediately. The boot hugs EVENLY across the top of the foot as you walk, without a single pressure point or hot spot on either foot. The boot tensions very evenly around the entire foot. This is so rare to find in a boot. The insole and the boot itself really works its magic in shock absorption with every step, and just today I was forced to run flat out for about a 1/4 mile, PURE JOY. next, weight, these boots are FEATHER LIGHT, and they feel that way, really easy on the legs and feet after miles and miles. Now, onto the what La Sportiva terms as their brake system. Let me tell you, this is not ad hyperbole, this system WORKS. The traction is the best traction I have ever gotten out of a boot. Period. So, all in all, this boot deserves 5 stars, wish I could give it more! I sure hope La Sportiva does not discontinue this boot, I am thinking of buying another pair just in case. For sizing, I find them standard, I had to go up just a half size from my walking shoe size. Plenty of room in the toe box, and I have wide feet. I am also a huge fan of speed laces, and here the Synthesis boot does not disappoint. So, there you go...get a pair and put a real smile on your face!


      Tough Hiker

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

      Since my initial review I've worn these boots through some rough conditions, in Iceland, and they are still going strong. Hiking up glacial canyons, through creeks, and shooting photos in wet areas for 12 + hours a day, as well as hiking on glaciers, these boots have proven their worth. The gore-tex keeps your feet dry and the simple lace system stayed snug and did not require much adjustment throughout the day. Uphill and downhill traction were great and hopping across creeks on wet rocks were no problem. The lace retention tabs have torn off on mine but not a big deal. The toe is separating from the front of the shoe but has not affected traction. Would recommend these boots if you're looking for a lighter option and not packing more than 20-25 pounds.

      Tough Hiker

      Get A Grip

      • Familiarity: I've used it several times
      • Fit: True to size

      I've used these a handful of times and so far they are outstanding. I have a wide foot (size 9 2E in Brooks for reference) and have severe navicular drop and generally have a difficult time finding shoes/boots that fit without pain. I purchased a size 9 (42). I was surprised when I tried these boots on because they fit and felt good. It's been hot and dry in my neck of the woods so I have yet to test out the gore tex. Overall construction is solid and the lace system is quick and easy. Traction is great when hiking. There is even a tab sewn into the lace retention strap that makes it easy to secure...nice touch La Sportiva!

      Hi Jason,

      My foot is wide from the toes to the midfoot. I'm not a fan of tight toe boxes either. I did not have any problems with my pinky toe with these shoes. Hope this helps and thanks for reaching out. If you try these and they don't work out BC makes it easy for returns.

      Jason B.

      Just want to let you know that I had the same experience with the synthesis. Pinky toe knuckle was the pressure point and sizing up caused too much room (front to back). Judging the shoe by the sole and boot print, the width looks sufficient. In my opinion, the problem lies in the taper of the upper and towards the toe box. Seems sportiva wanted a snug fit (great idea) but overlooked the forefoot overlays for some much needed "give". Also, the speed lacing system needs improvement.

      Worth $500

      • Familiarity: I've used it once or twice and have initial impressions
      • Fit: True to size
      • Size Bought: 9.5

      First off, Backcountry is amazing -- unmatched customer support gave me the confidence to buy this product in the first place. I love shopping with BC. As for the product itself...amazing.

      The day after I bought these it rained hard enough to run 2 inches of water across my lawn. I used this perfect opportunity to traipse around through the rushing torrent for about 20 minutes to see what would happen. Initially, I felt the temperature difference and became pretty worried. You notice when your feet are surrounded by cold water even if they aren't actually wet.20 minutes later, however, I still had bone dry feet. I stood directly under the gutter and let water pour over them...still dry. I grabbed my umbrella and walked a few laps around the neighborhood thinking that maybe water would seep in over time. Nope. The waterproofing is excellent. More importantly, these are nearly as comfortable as my Asics. The support is very good and the Vibram soles are solid. They are surprisingly light, and as sexy as they are in person as they are in pictures. Overall, I could not be happier and will savor every opportunity to wear them. here is a quick summary:

      Comfort: 10/10
      Weight: 10/10
      Waterproofing: 10/10
      Durability: Undecided, but I am confident enough to take them on a 1 month AT hike, will update afterwards.
      Breathability: Undecided. Not enough use, will update when able.
      Fit: True to size, exactly the same as Asics.