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I wear a UK 10, 4E / EU 45 pair of Brooks Running Shoes. The AKU 46.5 is perfect for me considering I'll be using it at very high altitude. It is reasonably warm, and sufficiently waterproof. Layer up socks accordingly for colder temps.
AKU is perhaps the only boot which doesn't squeeze my toes. Which is probably the most important factor to protect against frost bite.
I would love to see a double boot from AKU for -40 to -50 ° C. I will surely buy it.
Outstanding customer service.
The boots are great. I wear a size UK 10 / 4E width running shoes. UK 11.5 is a good technical fit for me, including accommodating for swelling of feet at altitude.
Overall I am extremely satisfied.
I have a slightly wide feet compared to it's length which make it sometimes challenging to find a right fit. those boots are super confortable right out the box and fitted around my feet shape and ankle way better than other iconic mountaineering boots brand.
So far I have been using them mostly while ice climbing.
I usually wear a 10.5 for trail running and hiking shoes, I choose a 11 and I have not suffered any toes injury from hitting ice wall. My feet and ankle feels snug and well maintained yet not restricting bloodflow and I can move around my toes individually if needed.
My feet have stayed warm while being outside all day at -20C while alterning between static and active phases.
The lacing system is extremely convenient, enabling you to dial the tightness independently between the ankle and the feet.
Patricia from customer service was very helpful in answering my question about the product.
The only downside I found so far, it that they tend to loosen up a bit as the day goes. This might get better the more they break-in thought. I also wished they were a tad lighter (2080 gr/pair Size 11)