Skimo boots are taking a jump-turn for the better! The La Sportiva Sytron is the epitome of next-generation race-weight boots, capable of much more than previous iterations. The svelte kickers offer improved ski-performance and durability versus the Syborg. This includes a beefed-up gaiter and a ski/walk mechanism that flips up completely to avoid getting snagged when booting. The liner has been upgraded and the lower shell has a burlier and more-effective Spider-buckle to lock your foot in place. The soles remain awesome and there is a scant weight penalty for all the new joys. The Sportiva Sytron is an affordable, ultralight ski boot worthy of racing or taking on bigger objectives.
- CavoBike Lever Pro system emphasizes fast, simple transitions.
- 75° of articulation exceeds the capabilities of the human ankle.
- improved gaiter warmly invites imagination while accessing lines.
- Grip Guard soles ensure embarrassment-free walks to the start line.
- Carbon-reinforced Grilamid cuffs enable maximum power transfer.
- Spider Buckle EVO secures the lower shell around your forefoot.
- Optional power strap increases responsiveness for bigger lines.
- Four forward lean options offer a personalized skiing experience.
- Sytron Liner uses elastic webbing to comfortably wrap your foot.
- S4 toe inserts help guide the boot into a tech toe, but also allow hands free step-in capabilities with the Ski Trab Gara bindings.
- Sportiva heel-pocket ensures a precise fit and blister-free day.
- Includes flexible plugs to prevent snow-entry near the Achilles.
|Weight (pair)||1924g 
||1 CavoBike Lever Pro, 1 Spider Buckle Evo|
||75 [35 Back/40 Front]|
||14, 16, 18, 20|
||Grilamid lower, carbon-reinforced Grilamid cuff|
||Sportiva Grip Guard|
|Skimo Co Says|
|Usage||Racing, speed touring|
|Notes||New S4 inserts make centering the boot super easy|
|Bottom Line||Great race and go-fast touring boot|
|Compare to other Race Boots|
Questions & Reviews
The switch mechanism broke when my friend switched the boots using the actual lever vs using the buckle like they are designed while playing with them --> this is EXPLICIT when you get the boots not to do this, I just forgot to tell her not to, so that's on me. and that meant the boots would switch to walk mode when in downhill leading to some fun(gnarly) falls. A ski strap works but it's annoying when transitioning and all would be needed is a small replacement piece as it's just some plastic missing.
Pros- Ski *incredibly* well! Super comfortable on the ascent. Easy transitions. Great adjustability even on the fly. Stand up to abuse. I went from using skimo race boots for everything from races to big powder days, committing lines (for me), moderate ice climbs, and 14er descents due to their light weight and all around utility. While these are a tad heavier, the do everything mentioned above while skiing sooo much better. All I changed in my ski setup was the boots and I was skiing way better in tough conditions like high mountain breakable crust. The forefoot buckles two positions are really nice when skiing on cold days allowing warmth and circulation and a quick flip makes them tight for hard skiing. The upper buckle is very customizable for an exact fit. The design easily accommodates crampons of all types. I have taken these out on races, resort days, deep pow days, and skied 12 fourteeners including some long semi technical routes with lots of crampon work utilizing either race skis and some slightly beefier options. The boots have been great for everything. Long hikes to tough descents, these boots are great. They are also easily punched at home. They also stand up to lots of use well - note the treads in the pictures.
Cons- I'm not super impressed with the liners which are thin leading to some sore ankles pretty quickly. Aftermarket replacements are now on hand and seem like something I should have done a while ago. JBO and the awesome folks at skimo.co can get you set up there. The second con is the little cord that secures the upper cuff buckle. It abraded pretty easily and will surprise you when it fails. Keep a lighter on hand so you can melt and re-thread the busted end- you can probably do this 2-3 times before replacing. Have replacements in your kit! Of note, these cord issues are way less of a nuisance than those experienced with the old Aliens.
Fit notes- I wear 11 US men's running shoes and am at home in a Dynafit PDG 28. I had some green plastic Aliens in 28 and they were too tight in the foot. The Sytron 29 is a perfect fit. I think the Sytron is an excellent fit for a medium to low volume foot and lower leg. Wide feet might be a tough fit.
In summary, these boots are awesome. Just deal with the mediocre liners and be prepared for the cord issue. You will be ripping it up and loving every minute with these boots!
How do the Sytron compare to Alien RS ski wise? La Sportiva states flex of 100 while Aliens RS is 95, suggesting they should be even more solid. Is it the case? I have skied in Aliens RS for about 2 weeks this season on light weight set up (Blizzard Zero G 85 and Kreutzspitze GT) and it completely blew my mind. Amazing on up and down. Enjoyed steep icy, soft pow and everything in-between, even slushy moguls on the piste. The problem is the Aliens are too tight on one of my toes and too my toe nail off. So thinking of replacing them with Sytrons as the Sportiva sizing should be half size up. On the other hand do not want to sacrifice rigidity and performance. Are the Sytron a match for the Aliens Rs?
For reference, I have a Scott Cosmos II (white) and am looking for a lighter boot for days more tilted to touring over distance than steep or deep.
If durability could be quantified by the frequency with which failures happen unexpectedly in the field, the Sytron and Alien RS seem to be very close to one another in that regard. That being said, the Sytron has almost no wear items and the Alien RS does. The wear items on the Alien RS are relatively cheap to replace, they give you an enormous window to replace them, and are pretty transparent with how they're doing in terms of wear and tear. Apples to oranges maybe? Er, Alien RS's to Sytrons I guess?
I never used AT boots before. And I'm going to use them more in expedition style backcountry skiing, like on Yukon or in Greenland. So, feeling comfortable and warm for multi-day trips is important.
My La Sportiva Barnutze double mountaineering boots are US 8.5 - 41.5
My Alpina Alaska NNN-BC boots are US 8.5 - 42.
So, maybe 27 is a safer bet for Sytron? What do you think?
I've had the RS for a few weeks now and I'm not sure I'm digging the slacker forward lean angle. I've bumping them from the stock 9 degrees to their max of 13, which helped but I think its still less than what I'm used to and is taking away from the ability to utilize the higher cuff . Anyone know why Scarpa would put a max forward lean of 13 degrees on the RS when both race boots as well as more performance oriented downhill boots (like their of F1) have max angles in high teens and low 20s?
Liners: the liners are far better than the Syborg liners. I really like the elastic over the forefoot. With the Syborg boots I used the liner from the Spitfire. The one caveat is that the boots are much more tight to get on, and I doubt the liners I used to use would fit inside easily.
Width: Though these claim to have the same width as the Syborg, they feel wider. I needed to punch my Syborg boots in 3 places, so far with about 5 days on these I feel no such pressure.
Volume: These feel lower volume than the Syborg. They are a bit more difficult to get on, I think due to the new forefoot buckle which is more difficult to move out of the way. Speaking of the forefoot buckle, I am at the loosest it can go and it works, but I would really rather have a little more wiggle room. The wire for the forefoot buckle doesn't appear to be user replaceable so I may just have to live with it. I do like the fact that it is a 2 stage buckle, so you can loosen it up quickly for the up and then tighten half a step for the down. I would likely just leave in the looser position for racing, but for ski mountaineering and touring I would use the functionality.
Mode change: The new metal mode change buckle is far better, as is the fact that the vertebrae flips all the way up. So far it is a very smooth and fast transition. I have not used crampons with the boots yet.
Gaiter: The gaiters seem to be more durable than the plastic used on the forefoot of the Syborg. However since it is permanent with no zipper like on the Syborg it can be difficult to get my foot with high arch in the boot. Also if I put the liner on first(like the alien 1.0) and try to slip my foot+liner into the boot, the gaiter gets pinched in the rear and I feel I'm wearing it prematurely. I do like the idea of a more waterproof ski boot for spring ski mountaineering and long days in deep snow.
Overall I am very happy with these boots. They are a significant improvement over the Syborg in every way I can think of.
The RS and Sytron are what I like to call "Race Plus" boots, meaning they're designed on the same platform as a race boot, but it has a few extra features that enable it to be skied REALLY hard. It'll offer slightly more protection from the elements and a bit more warmth, but it still maintains the same lightweight and agile walking capabilities as a full-blown race boot. I haven't skied the Alien RS yet, but a few guys from the shop have and they all rave about it...it's spearheading a new generation of high speed ski touring and mountaineering. The Sytron operates under a similar mantra as the Alien RS (a lightweight race boot, but with some more features that make it more "real world friendly"). I'm eager to get in both of them, they're both key players in the new "Race Plus" category that the ski mountaineering and light 'n fast touring market will be seeing shortly. Stay tuned for more info, we'll be seeing them shortly!
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