Winter returned to the high peaks of the Wasatch Mountains this week and so did I with the backcountry ski boots that I’ve come to love this season – the Garmont Radium Alpine Touring ski boots. I’ve used them in waist deep powder, early season thin conditions, ski mountaineering on Mt. Timpanogos and even some yo-yo sessions at The Canyons the last time being April 4 when one of the deepest storms of the year laid down two feet overnight.

While I’ve still got some big lines to ski this spring as ski mountaineering season kicks in, it’s time for a proper review from what has so far been a great season of backcountry skiing here in Utah.

Garmont Radium Ski Boot Overview

In January 2008 we had our first look at the Radium while at the Winter Outdoor Retailer show and Jason did a quick overview of the Radium and its features based on checking it out at the show. The Radium is a new style of backcountry ski boot that combines elements of what you need in the backcountry with the comfort and performance of the overlap plastic–which is common in alpine ski boots (unless you’re still rocking the rear entry classics).

Kendall Card getting deep in his Garmont Radiums

Sure I was excited to slip my foot into the Radium but I was a little hesitant as this was the first backcountry ski boot with a traditional overlap and four buckle that I had skied in. The dual Pebax plastic with Garmont’s overlap boot technology takes a traditional mold but the tradition pretty much stops there. The standard part of the boot is normal height but in front of the tongue is a tall extension of the overlap plastic. This is only one sided as the under layer of wrapped plastic stops about mid shin. This combination provides just enough additional flex strength when you’re headed downhill but keeps the boot light and nimble. At 6’4″ and just over 200 pounds these are important for me.

One other thing that had me was the additional weight I would be taking on. I have been used to lightweight 3 buckle designs (Scarpa Spirit 3) and have shaved weight by switching to Dynafit bindings a few years ago. The Radium comes in at 4 pounds each on the 27.0 (which is only 6 ounces heavier than my Scarpa Spirit 3’s that I’ve been using for long tours and mountaineering adventures). My hope was that the 6 ounces would be worth the stability and extra support. I wasn’t disappointed.

Bootfitting the Garmont Radiums - Surefoot at The Canyons

Garmont Radium Review

Literally there was no period of getting “used to” the Radium. Fresh out of the box and after a session at our favorite boot shop Surefoot at The Canyons I was skinning on long tours without any fickle fit or comfort issues. With the anatomical fit of the shell, I was sure to have the boys at Surefoot put a toe tap on my feet when doing the heat fit of the liner so that I had ample room. I’d recommend this as I now have a perfect fitting boot.

In the field I first noticed that the walk mode provided ample flex for even the long Uinta tours I’m accustomed to. Easy kick and glide performance as well as booting up a steep ridge–the flexibility was nice. For skinning I typically unbuckle the buckles leaving the power strap engaged. The patented locking mechanism on the two upper buckles did their job to keep the buckles engaged but open. It’s a cool feature but by the same token I’ve done this before with other boots without much worry of them coming fully unbuckled.


On thing I saw with the liner is that down near the toe there is little if no overlap of the tongue and sides of the liner. I thought for sure this would be a leak point from outside water but the Radium has what’s called a “G-Water Seal” which is the addition of some VERY small ridges on the bottom layer of plastic where the overlap takes place. These ridges kept the water out and not once did I get leaking in 22 days on the Radiums.

Garmont Radium Review

As for the downhill, the strength from the overlap construction let me open things up like I was skiing in alpine boots. Case in point – just a few weeks ago when at The Canyons I headed up 9990 and was going to get out the gate into the backcountry. The lifts had barely opened and with 22″ of new, so I dropped my pack at the top of the lift and spun 3 quick laps–hitting the steep headwall and a Mr. Roper to Fantasy gate just as I would on my alpine set up. It was cool to be making the same exact turns, choosing the same lines I would charge on my alpine boots but this time in an AT setup. The result – big smiles and charging it just like old times.


After that we headed out the gate doing 2 quick laps off the bootpack, two skins up Dutches, a trio of Desolation laps (image above) and two Square Top laps coming back through the resort each time. Typically a day like that of lifts, in-bounds powder skiing, skin tracks, booting and groomers would mean you have a boot that is deficient in one or more of those scenarios, but not with the Radium.

One thing that seemed different from the Garmont Axon or the Scarpa boots that I’ve skied is the Dynafit toe attachment points seemed farther forward on the boot. Aside from throwing me off while stepping in a few times, I didn’t notice a decrease or increase in performance or efficiency while skinning. Perhaps it was just me.

As the season is coming to a close, for the first time in a few seasons I know that going into next season I have ZERO need to upgrade my backcountry ski boots. It’s that kind of season-to-season confidence and longevity that I think all of us seek when making a substantial purchase that is ski boots these days.

The Good

  • ALL around performance – the Radium lives up to the hype and is a performer in and out of bounds, including long tours and mountaineering.
  • G-Fit liner is comfy and the easiest on/off boot I’ve had.
  • The Garmont proprietary sole is bomber for scrambling and ridge walking.
  • Anatomical foot design gets rid of excess space but still gives ample room for even wide forefeet like mine (I typically wear a 101mm alpine boot width and didn’t have to do anything to the boot after heat molding the liner)

The Bad

  • I’d add just a little width and length to the plastic on the tongue of the liner to give it a bit more forward flex stability for the big guys
  • The Walk/Ski mode flip is tough to move from ski to walk with gloves on. I’d make a slight change to this by giving it a little more angle at the end of the lever

The Bottom Line: Garmont Radium

Garmont was able to take the backcountry skiers needs of a lightweight, Dynafit-compatible boot and combine it with a 4 buckle overlap design that was still nimble enough for the long dedicated ski tours but could still rock the down in any condition. A tall order to fill. I’d say that the Radium is going to be a tough act to follow for Garmont or any other boot manufacturer looking to keep backcountry skiers happy while adding performance for the folks that like to mix in a few laps on the swings.

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About Author

Kendall has long been known for his passion of the outdoors. In the past 10 years his love for skiing, particularly backcountry skiing, has defined his pursuits. He's also been active in trail running, mountain climbing, rock climbing, ski mountaineering, cycling and has recently taken up backcountry bow hunting. Aside from writing reviews on he also reviews products on and is co-founder of


  1. Jason,

    I’m currently using a pair of Garmont adrenaline’s from 2008. They’ve last ~100 days max. Needless to say that’s disappointing, buckles are irreplaceable, heel pivot cap blew out requiring home-made jank repair, on and on.

    I fit garmont very well, and they seem to have addressed the poor design issues from the previous generation, so I’m willing to buy a second pair despite great new boots from virtually every touring boot maker.

    Any ideas what’s going to happen to the radium for the 09 / 10 season? there aren’t many 27.0s left in the 08 / 09 model.

  2. I would love to use these both on my touring skis and my alpine set up. I’m told its dangerous to use these on regular bindings because of the grippy soles. Any thoughts about that? Unlke the dynafits, they don’t seem to sell interchangable soles. I wonder if its possible to just put duck tape on the bottoms or something when i’m using them on my alpine skis.

  3. Pingback: Lightweight Alpine Touring Ski Boots Coming Fall 2010 -

  4. Roger Bertsch on

    I just purchased the Garmont Radiums. It was a boot I had not researched since I’m selling a pair of Garmont Adrenalins. The folks at Mt Gear in Spokane said to try the Radium. I had also tried on the Factors and the Titans. I think the Radiums are slightly stiffer than the factors. I don’t know about the Titan as I could not find a fit. The Raduims have a solid fit for me so I did some research and made the purchase the next day. Sometimes the local gear shop can make a difference — here with both a recommendation and a good boot fitter. I’m a ski patroller and relatively new to AT and backcountry skiing. I skied today and experienced the early day hard snow of Spring followed by progressively softer snow leading to slush. Had I not know these were AT boots I would have said I was skiing on a high quality free ride boot. With these boots my K-2 Mt Bakers with the Diamir Freeride Plus carved like a dream. Interesting comments on the fit. Normally I ski in a 26.5 but in the Radium, I’m in a 26. I did only a couple of minor on the hill adjustments with the buckles. I found the walk/ski switch easy to use even with ski gloves on. A recommendation I would make to Garmont would to have interchangable soles so the Radiums would work with a traditional alpine binding. I’m lucky in that my powder skis have the Marker Duke and the Duke and Baron are both AT compatible. All in all, I believe I made a good purchase and one aided by a great gear shop.

  5. I read here concerns of using Radium with normal downhill bindings. Can somebody please enlighten me why it is not possible to use Radium in a normal downhill setup? What is the issue of grippy soles and normal bindings?

    • Technically nobody should be using any AT boot in an alpine binding, so you won’t get an official (or even close) answer. I know a lot of people do it, and provided you compensate with your DIN setting it might be ok. I do know of people who’ve used the Radium with alpine bindings.

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