With two reviews of expensive double boots on the Blog and more coming of similar models I think the use of double boots might need some explanation.
The majority of my alpine climbing has been done in the Canadian Rockies in winter or in the Alaska Range in spring.
In both places a good single boot and decent gaiter will get you by, generally, in perfect conditions. The problems arise not in the perfect conditions but in the exceptions both in the weather conditions and temperatures. As important or maybe more import is the physical condition of the climber.
Open bivy high on the North side of Deborah May '76
Frostbite is not generally a cold issue believe it or not but simply a physical exhaustion and dehydration issue of climbers strung out in difficult conditions. Double boots are a reasonable insurance policy to avoid a cold injury when you are dehydrated and exhausted and still having to keep moving. Sounds pretty much like any worthwhile alpine climb doesn't it?
While expensive, quality double boots are nothing compared to the price of what even a short stint in the hospital from frostbite and the resulting down time will cost you long term. Not to mention the resulting cold sensitivity that will follow you well into the future. The result of a serious case of frostbite is you'll either stop climbing in cold weather or you'll buy double boots after the first incident. My suggestion is buy the double boots up-front and save yourself the worry and pain.
With all the new climbers able to get out and crag climb long before they jump on difficult alpine climbs single boots are the norm. The single boots generally climb better and are cheaper. The same single boots are generally over kill for most things, including Rainier in summer. So, of course we all want to use those same single boots...that aren't cheap either....all winter and on every climb.
A good percentage of the time you'll get away with it. In Canada these days most climbers won't go out if the temps drop below -15C. That is up from the old norm of -30C as the temps we generally called it off. One of the reasons is most boots are not comfortable climbing below -15C unless they are double boots.
Galiber Makalu dbl boots, late '70s.
The other important reason to invest in double boots is the amount of time you can comfortably spend out in a cold, harsh environment. No they aren't fun to walk in or climb difficult mixed terrain in. But both can be done adroitly with a little practice. You might find they climb ice better than your single boots in fact. On moderate, long, ice routes, most will appreciate the added support and calf relief of a good double boot. The most important reason to look at a double boot is the ability to keep the liners unthawed and warm over night and if required dry the inner out in your sleeping bag. If things really go to shit and you have an open bivy the fastest way to thrash your feet is to be laced into a tight pair of single boots. Better yet on a open bivy you can loosen a dbl boot a bit, gain some warmth usually by doing so, and still keep your 'pons bolted on the boot and not worry about loosing gear. It is a big advantage.
The advantages of a double boot are significant to keeping your toes and feet in good health. The down side is first the expense, and then the ability to climb difficult ground in them. That can be over come with climbing time in the boots. Lastly the bulk and weight. The newest boots are getting better but it is still an issue to be over come. Worth the effort to climb in doubles unless you feel like the risk of damaged feet is lower than I do.
On frozen feet after an open bivy at 13,800 in Nov.
Some will wonder about the Batura and Phantom guide style boots (single boots with attached "supergators") as a less expensive (if $500+ is less expensive) option to a true double boot. This style of boot has two design features that limit their use in similar conditions. They are both very difficult to dry out and keep unthawed on over night or longer trips. And the ankles are generally a lot softer and more flexible than a true double boot. So you lose the extra ankle and calf support as well. My take having used a Batura for a few years is they are good one day boots on cold days but I would never take them out over night intentionally. Each style of boot has a place. Just don't trust the advertising to help you decide when and what is right for you.
Times haven't changed much. Good (read winter technical boot) double boots would/do cost a lot more than a good (read winter technical boot) pair of single boots. That changed for 20 plus years as plastic double boots dominated the market place. No matter your skill or experience level plastic double boots were common on almost every mountaineer's feet. And for good reason..they would keep your feet warm and dry in just about any condition...some times too warm. For years you could easily assume that anyone who did technical ice climbing or went out in winter would own a pair of plastic double boots.
Not so today. And because of it I am seeing and hearing of frost bite injuries again outside of the greater ranges....which had been, until just very recently, a thing of the past.
One of my litmus tests for winter climbing partners, 30 years ago and again now is, "do they own double boots?" It doesn't mean that you use double boots on every winter climb.
But if they do, I can generally count on the fact they take their own survival and climbing seriously. That is usually because of hard won experience in really cold weather conditions. So I can worry less about them getting a cold injury and both of us staying healthy on our adventures. And just as often the owner of a pair of double boots is likely to value his partner more than some one with less experience would. Surprised? You shouldn't be. It is all in the details.
If you plan to go BIG and go LIGHT....the place not to short yourself on gear is your boots...go BIG there first!
A pair of Herman Buhl's cold weather boots.
Hermann Buhl (September 21, 1924 – June 27, 1957) is considered one of the best post-World War II Austrian climbers and one of the best climbers of all time. He was particularly innovative in applying alpine style to Himalayan climbing. His accomplishments include:
1953 First ascent of Nanga Parbat, 8,126 metres (26,660 ft) (solo and without bottled oxygen).
1957 First ascent of Broad Peak, 8,051 metres (26,414 ft).
Before his successful Nanga Parbat expedition, 31 people had died trying to make the first ascent.
Buhl is the only mountaineer to have made the first ascent of an eight-thousander solo. Just a few weeks after the successful first ascent of Broad Peak (with Fritz Wintersteller and Marcus Schmuck), Buhl and Kurt Diemberger made an attempt on nearby, unclimbed Chogolisa peak (7654 m) in alpine style. Buhl died when he fell through a cornice on the southeast ridge near the summit of Chogolisa. His body was never found.
"Buhl was very lucky on Nanga Parbat, escaping with just a few frostbitten toes. This story reflects Buhl's style of climbing; totally focused and by taking enormous risks he often succeeded where others failed."