In reply to UKC Gear:
I have a sort of related question and it drives from seeking a toebox that fits my very blunt angled toes (little taper).
I think there is just as much art to the length issue as anything else. Nearly every modern shoe is designed with a randing system that applies forwards pressure. That means that, within a reasonable range, they will always encourage your toes to curl - all that changes is how far your heel stretches this rand and goes back into the heel pocket.
The result is that - should you want to get a shoe that doesn't have any bag in/below your heel - you are effectively sizing to the tension of the rand.
I run in a 44-45 or 10-10.5. If I put my foot into a Skwama, I cannot get a heel without baggy space until I size into a 7.5 or 40.5. I think RockRun suggest -2.5 Euro, The article suggests I should wear something like a 43. I could probably put that on with two pairs of Mountaineering socks.
But the logic dictates that I don't climb anywhere near hard enough - perhaps one should just do everything below 7a in approach shoes? And everyone's got a story about they one bloke (normally a bloke) who undersized for so long that they got permanent foot problems. Do I want to be that guy?
I see plenty of people at the wall wearing something like a Drago so large that they could get someone else's foot behind their foot in the shoe. Am I the dinosaur? Does space in the heel when you point your toe mean anything?
Post edited at 08:48