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  • Gore-Tex Extended Comfort lining and Gore-Tex Surround footbeds provide 360° of breathable and waterproof protection to keep feet dry, both from inside and outside
  • Award-winning Gore-Tex Surround technology results in all-around breathable and waterproof hiking footwear that moves sweat quickly away via patented open construction
  • Moisture and warmth escape from below your feet through the Gore-Tex membrane into a spacer, and from there through vents on the sides of the shoes
  • STB technology wraps the midsoles and unifies them with the uppers for stability and a locked-down fit
  • Vibram® Nano rubber outsoles provide aggressive traction
  • Backpacker magazine conducts rigorous field testing to select award winners in recognition of their innovation in design, materials and performance


View all La Sportiva Men's Hiking Shoes

REI membership


Best Use Hiking
Footwear Height Over-the-ankle
Footwear Closure Single-pull Lace
Waterproof Yes
Upper Mesh/polyurethane
Lining Gore-Tex Surround membrane
Midsole Compression-molded EVA
Support Thermoplastic urethane insert
Outsole Vibram Nano rubber
Average Footwear Weight (Pair) 1 lb. 10.9 oz.
Gender Men's

Size chart

Sizing notes

For rock climbing shoes: Choose soft shoes two to three sizes smaller than your street shoe size. We recommend you fit your trad shoes one to two sizes under your street shoe size. Remember to factor in stretch. Unlined slip-lasted shoes tend to stretch about one full size. Lined shoes stretch about a half size. Remember: a well-fit comfortable shoe will work better than an ill-fitting tighter shoe. For boots: Add one half size to your street shoe size. You should be able to slip one finger behind your heel when you are standing up with the boot unlaced and your toes touching the front. If the boot is too short, your toes will get smashed walking downhill. Too long and your heel will slide up and down and give you blisters.

Rated 5 out of 5 by from Wonderful if your feet run hot I have had these for little over a month and have put 20 miles on them so far. I've been frustrated with the last three pairs of waterproof hikers I have purchased as my feet seem to bake and get sweaty in them. After reading the review of these in Backpacker, I decide to give them a try and they have made all the difference. Feet are not nearly as warm or sweaty at the end of the hike. Very comfortable and lightweight. Lacing system is very flexible and effective. I have had them out in the rain through puddles and they have kept water out. I have not swamped them thoroughly though.
Date published: 2015-03-25
Rated 3 out of 5 by from Very comfortable, fell apart quickly I purchased these in April. Walked four miles, hiked Mt. Ida in RMNP (just under 10 miles RT) and when I went to put them on to hike Grays Peak, the toes were peeling off. The are one of the most comfortable boots I've ever worn so I was really disappointed. I bought them after doing a lot of research on highly breathable boots. The are by far the most breathable boot I've ever worn and are well cushioned for my hike up/ run down Colorado 14er trips. I have exchanged them for a new pair and they held up to Pikes Peak (14 mi RT). I'm hoping I got a defective pair because aside from the toe peel, I love them. Because the jury is still out, 3 stars with a yes recommendation. 5 stars to REI for taking care of the exchange perfectly!
Date published: 2016-07-22
Rated 5 out of 5 by from Dry and secure Just finished my first three day trip over Koip pass in Yosemite. I was surprised by two feet of snow that covered miles of trail and occasionally a few inches of it would cover talus on very off camber slopes making footing very tricky and very important considering the consequences of making a footing mistake. Had I known this ahead of time I might have used my midweight Kaylands or Renegades. But here I was and these guys not only held their own on the sketchiest of terrain but the new Gore Tex thing worked despite the uppers being soaked at times. I sure don't miss the weight, the ankle bite from stiff uppers, and the swampy feet of my other boots. I was carrying a decent 35 lbs. The synthesis didn't care.
Date published: 2015-10-12
Rated 5 out of 5 by from So Far So Good. I bought these as a replacement for my well-used Keen Targhees. They took getting used to because they feel like a athletic shoe on the sides. I wore them around town for a week. Then I took them up Mt.Whitney. 22 Miles and they were outstanding. My feet were sore (but not as sore as they were in my older boots with less mileage. Great Grip, many slippery rocks. Waterproofing seems to work as I stepped in a few puddles (no full immersion). No idea yet on the longevity of the shoe, but for pure functionality it kept my feet dry from water, and dry from ventilation. The most comfortable tongue of any hiking shoe I have worn. Ideally I would write a review after owning them for years, but I think I would forget. But 22 miles on an intense hike, after one week of street use, pretty impressive.
Date published: 2015-07-29
Rated 5 out of 5 by from Tough but comfortable Just got these and have only hiked about 20 miles in them so far, but they required NO break in time and are already the most comfortable trail shoes I've worn. I can't ever imagine going back to clunky boots! The traction is excellent, the unique shoe string design stays tight but is easily loosened for quick on/off stops. Feet never got hot enough to sweat. The only con I have found is that if you're hiking in muddy terrain, the mud will cake on the sides and in the cell network of the mesh, but is easily washed out. Just don't expect that cool green color on the sides to last as they get dirty!
Date published: 2015-04-04
Rated 4 out of 5 by from Be sure you know what you want them for Pros: No break-in needed. Extremely comfortable right out of the box. Lightweight. Nimble. Very slick quick-tie system. Waterproof. Cons: No real ankle support. Cushy to the point of feeling the contour of the ground too much. A bit too much "play" side to side on uneven terrain. Showing signs of rapid wear in the uppers. I own many different pairs of La Sportiva. I love this shoe company and have had good luck with many of their products. I bought this in planning to use it as a lightweight hiker for a multi-day backpacking trip this summer. After purchasing and using them for a while around town and on some simple off-trail forest hiking in Wisconsin, I have decided to leave them at home. Simply put, they really are a modified running shoe. You could certainly hike with a light pack with these. But in my opinion, if used for backpacking, they really are only suitable for very light packs on simple even-trail terrain. The support they offer, along with side-play and a cushy feel underfoot are not really the best formula for hiking with a moderate or heavy load over trails that are rough and uneven. I would expect that the soles of my feet would become very sore from feeling rocks and other uneven features through the sole, and the cushy feel and side-play would make it a bit dicey with regard to ankle support with a moderate pack on such uneven terrain. I am also not thrilled with how they are holding up on mostly around-town use. The black toe sole-fold is already peeling away. The side (spiderman) mesh is breaking (although I believe that is mainly there for abrasion prevention) and the elastic lace tuck is wearing out very rapidly. Believe me...these are fantastic day-to-day shoes! They are extremely comfortable. You can work all day in these things and your feet stay happy. I got stuck in a big downpour the other day and my feet stayed dry. These are great shoes on many levels. But as a hiker with a pack of moderate to heavy load on uneven trail, I do not believe these shoes would cut it for me and I would rather not risk the comfort and pleasure of my upcoming trip with an experiment using these. They are also a bit pricey considering their manufacture and ability to hold up with use. They cost the same as a good pair of sturdy hikers from the same company. I recommend these only if you really think hard about what you intend to use them for.
Date published: 2015-04-10
Rated 5 out of 5 by from Great boot! Fits like a trail runner, really comfortable. I was concerned with the soft upper toe but it's been a non-issue with the toe front being rigid. Zero break-in period. I'm transitioning from Salomon mids and these La Sportiva's are way more foot friendly...I no longer look forward to taking the boot off after a full day on the trails. Hugs your feet nicely with a great grippy bottom, haven't slipped yet.
Date published: 2015-03-22
Rated 5 out of 5 by from Great boot for hiking and running on trails My wife and I bought these boots for our trip to Italy where we were carrying full packs and hiking on easy trails. Fate stepped in and the easy trails were closed so it was up and over the mountain routes. The boots were super comfortable from the start with no break in needed. With heavy backs and steep trails we had adequate support excellent comfort dry feet. The sticky rubber lug sole grips better than any boot or shoe I have owned before and I am nearly 55 years old so I have owned a lot of boots and hiking shoes. We have yet to use these boots off trail, but we also wore them in towns on streets, it was the only foot wear we wore and our feet were very happy. The lacing system is simple but works great. There is another review that speaks of the technology so read that as well. When we got home from our trip (we live in Alaska) we ran with them on trail and roadway, they again shined with comfort cushioning and again dry feet. They are well worth the price. I attempted to upload a pic to show you the boot in action, but REI said the pic was to large.
Date published: 2015-03-21
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I am interested in these for a 28 mile day hike endurance event, what is your opinion?  I would also like to use them for up to 3 day hikes up to 10 miles per day 30 to 35 pound pack.  I am a size 12 and big guy 270 lbs.

Asked by: Dawg55
If you'll be doing any steep slopes you might want to think about ankle support, I have these and they're great, the tread is AWESOME and they're comfy. But as a bigger guy, when I go down steep slopes my ankles need support. 
Answered by: thatkatmat
Date published: 2017-01-04

Son has had these boots for a while, and the laces are starting to fray and one has broken. Do you have any recommendations on replacement laces for these. He loves the boots, but cant wear them right now

Asked by: scarycrow
The Salomon Kevlar Replacement Laces 2 Kit would be a great option for replacing the laces on your son's boots.
Answered by: REIservice
Date published: 2017-04-11

Is those boots would be good for kayaking. Since I pass almost 20% of the day in water and the rest inside the kayak, portaging or camping, will the boots will ventilate enough so I could be comfortable?

Asked by: David Kayak Fan
While these boots are marketed as waterproof footwear, they are not built for ‘water’ environments. Even if you get into your kayak and your feet were dry inside these boots, it’s entirely possible that the humidity inside the cockpit could cause your feet to perspire.
Answered by: REIservice
Date published: 2017-02-20

It says this item is no longer available, not just out of stock. Are you getting any more of this item?

Asked by: mbhale
As of 6/2/15, we have a full size run in stock and ready to ship.
Answered by: REIservice
Date published: 2015-09-20

I know its apples to oranges but im looking to buy this boot, so for size comparison my medium duty boot is the salomon 4d quest and they fit perfectly with plenty of toe box room. Do these run narrow? Id be buy a size 47(US 13). Or go up to a 47.5?

Asked by: Mr CK83
La Sportiva used a last on the Synthesis Surround GTX Hiking Boots that runs wider.
Answered by: REIservice
Date published: 2017-02-09

How do I order a size smaller than a 42?? I'm looking for a size 41.

Asked by: johnsolo
The smallest size we offer is a size 42. If you would like a smaller size, please consult the manufacturer for opportunities to purchase.
Answered by: REIservice
Date published: 2016-08-30

Are you able to use an aftermarket insole (ie, Superfeet Green) with these boots without compromising too much of the breathability?

Asked by: TexasBackpacker
Yes, the stock insoles in the Synthesis can be removed from the boots to accommodate aftermarket insoles.
Answered by: REIservice
Date published: 2016-08-29

I would love to have these but 1) I'd really like the higher cut version. Any chance you'll be stocking that in the near future? And 2) If I did settle for the mids, I'm a size 45.5 and that is, as of 8/9/15, not available. We they be restocked? Thanks.

Asked by: Hikertrash900
The higher cut version is the Core High GTX. REI hopes to carry this boot in the future, however, we do not have a firm date at this time. As of August 2015, we don't show that we will get more of the Synthesis Surround GTX boots.
Answered by: REIservice
Date published: 2016-06-24
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