Awesome boots. I saw a deal I couldn't pass up and have these as my first pair of ice climbing boots (poser I know). But ive been out a handful of times and glad I spent the extra $$$. It was super hard to size them because I couldn't try them on locally. Here is some reference on how I sized them.

I own the following La Sportiva shoes and sizes:

TC Pros: 43.5
Miura VS (velcro) 43.5
Miura (Lace): 44
Helios 2.0 (running shoes) 45

As you can see, I own many pairs of LS shoes in different sizes, obviously looking for a different fit between their applications with some. Ultimately
I bought these G5's in 44.5 and they fit PERFECT. I am generally a US 10.5 and 28.5 mondo ski boot. So it looks if you have your Mondo sizing and use LS sizing chart above, you should be GTG.

Hope this helps,

Happy climbing.

I think the Sportiva G5 is the perfect boot for the types of climbing I do: frozen waterfalls in CO and Montana and extended trips to Peru and Bolivia. Long approaches are a breeze, they climb flawlessly, crampons go on easily and stay put, and they are really light and warm. Get them- you won’t be disappointed!

In my opinion, the bad reviews for not being completely waterproof are overstated. I don’t know if you can walk through rivers or whatever, but I’ve used these in countless wet situations from dripping wet frozen waterfalls, walking through deep slush, slipping while trying to cross a stream, to punching through a not quite frozen lake up to my shin without issue. To each their own. Peace.

Mostly used this for roadside and alpine ice in Ouray and the Cascades, where it has performed very well.
It seems like the most negative reviews are about not being waterproof, which is fair. I simply haven't needed to wade across many streams.

The heel lock down for climbing and release for belaying is amazing. Huge upgrade over batura 2.0 in that regard. But like others say, if you are not dealing with frozen terrain, they leak. But I'm a roadside cragger in cold temps so they are the best ice boots I've used. Anything involving slush, stream crossing they are a no-go.

I was surprised to see that those boots are NOT waterproof, water comes in through zippers.

I LOVE these boots. Upgraded from the Nepal Evo GTX and they are so much better imo. Very comfortable, light, warm and the climbing performance is awesome. The Boa lacing system is pretty slick too.

So I saw some reviews on the La Sportiva website stating that this boot is not waterproof. I got them myself to take a look, and these boots are really sweet. BUT THEY ARE NOT WATERPROOF. There is a direct path for water to enter the inside of the boot. The zipper is not waterproof, and the inner boot has no gusset or tongue (it's an open half-boot style). Thus, if you step in a puddle, saturated slush, river, or anything else, there is an clear path from cold water to your foot. I was pretty shocked by this, so I talked to the La Sportiva folks. After reviewing my comments, they are now updating the description of this boot to not waterproof but instead "highly water resistant." To be sure, if all I did was roll up to roadside crags and climb in super cold temps, these things would be a dream. But the risk of water logged feet for any alpinism seems a very high cost. How often do you cross a river, get slogged in a bog, or find yourself working through slush? I am disappointed.

These are the last pair of mountaineering boots i will ever wear (well, until they make a new version of this) - super light, agile, extremely warm, and great for every application from ice climbing to casual ridge walking.

They are essentially the same weight as the Phantom Tech but seem to climb a bit more natural, and fit my feet a bit better.

An easy decision for any mountaineering, especially if you think you'll be climbing in colder temps.