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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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    13 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?

    High Hopes

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

    I had high hopes to make these my next backpacking boots, but after having them for about a year now I'm not that impressed. I went a size up and they still feel a bit narrow and small - I could've gone bigger but they next size up felt too big. After about 6 months, both toes started to peel which seems crazy for boots at this price. The waterproofing was good, but not great after getting them pretty wet on a few hikes.

    Looks like I've gotten all I can out of these things, looking for something else for my next pair.

    Comfortable shoes

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: 8
    • Height: 5'3"
    • Weight: 170lbs

    I have worn these shoes for about 5 months now. They have been in show, streams, rain and mud, and dry surfaces from streets to gravel, dirt and rocks. I have had plantars faciatis in the past so I put off the shelf insoles in all of my shoes. I expect that doing that limits the gore-tex surround but it is something that I need to do. I have been very pleased with the performance of the shoe on grip for both wet & dry surfaces. The only real drawback or issue that I have is that I find that the heel compresses very easily now. As I tend to pronate as well I find that my heels tend to lean to the inside. If I change my stance and put more weight on the front of foot it naturally goes away. I'm not sure that it bothers me, I only notice it initially and I try to be more consious of my walking. But my balance is fine crossing streams over logs or rocks. I have put over 200 miles on these shoes and outside of the heel they feel great and still perform. They are still water proof. I have had some gore-tex shoes that after many miles I wear a hole in the gore-tex membrane where the shoes bends before the toes. But these are still going strong.
    I did find they were not good for snowshoing as the uppers are too flexible and the snowshoe straps dug into my feet. But they aren't meant for that :)

    Run small. Initial quality issues.

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: Runs small

    I want to love these but am on the fence. As others have mentioned, they run small. I ended up going 1 full size up. I usually wear a 10.5 and purchased the 10.5+ first. Felt snug at home, but after my first trip (20+ miles- climbing Mt. San Jacinto), it was obvious they were too small. Returned for a EUR 45, size 11.5 (I've never worn a 11.5 in any shoe). On both sizes, there was an odd spot at the back of my left heel that didn't seem to fit right. Figured it would wear in.

    Went backpacking (about 21miles- climbed San Bernardino Peak) with the new size this weekend. Got blisters on both feet in the same spot where I felt the issue on my left heel. Seems to be where the top edge of the insole transitions to the shoe. I'll try new insoles to see if that helps.

    Traction was ok. Scrambling over boulders and such, they felt great. Loose gravel/ sand was iffy. Probably an issue with all shoes.

    On both shoes, the toes have started to peel already. On the first pair, the sole of the heal started to come apart. To be fair, it was probably caused by me dragging my toes and scraping over rocks etc.

    They are light weight and didn't seem to take much/ any break-in to feel comfortable (except for that spot on the heel). Did not do any water crossings so can't comment on that.

    I noticed I did not get any rocks or sand in my shoes which was nice.

    I've never bought a pair of shoes this $$$ so I was hoping for a better experience. Might be my hiking/ backpacking inexperience, but, as I mentioned, I'm on the fence.

    Run small.  Initial quality issues.

    Almost Gore-tex

    • Familiarity: I've put it through the wringer
    • Fit: Runs small
    • Height: 5'10"
    • Weight: 165lbs

    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

    • Height: 6'2"
    • Weight: 160lbs

    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)

    Synthesis - Awesome, but runs small

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: 45 EU
    • Height: 6'0"
    • Weight: 195lbs

    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
    • Height: 6'2"
    • Weight: 175lbs

    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
    • Height: 6'4"
    • Weight: 200lbs

    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
    • Height: 5'8"
    • Weight: 175lbs

    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
    • Height: 5'8"
    • Weight: 170lbs

    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.

    Unanswered Question

    How does the sizing on these compare to the Wildcat Trailrunner, especially the toebox?
    I normally wear a size 11 but went to a 12 with the Wildcat and it is a perfect fit.