I totally endorse this. I've got a set of Altbergs that I've ridden in almost daily for the last 8 years (commuting and touring not RTW, but probably 120k miles total) and they've been bombproof, waterproof, totally excellent. The single zip is still going strong, and the velcro is only just getting a little tired. I don't really look after them that well either. Only criticism is that they are a bit clumpy for a road/sports bike. Miles better than my full on MX boots though, and fine for most eg old Guzzi, Triumph or XT600. It's true that they do get a bit warm but I've worn them fine in Morocco, S Spain in the summer etc. They've got a 'proper' Vibram sole too, and are ok for walking about in.

I bought a pair of Sidi Black Rain as a 'summer boot' a couple of years ago, but they feel like slippers after the Altbergs, and one of the zips broke after 2 months - back to the Altbergs!

Sidi Boots
 

Yeah, I couldn't agree more :thumbup1:
I ride in a pair of Sidi Discovery boots, a 3/4 MX style of boot which to me, is the best of both worlds - flexibility and protection.

I dont do a heap of off-road, but when you are travelling RTW as you intend to do, who knows when you are going to hit a 100km stretch of unpaved, washed out, potholed dirt road!!

For me, you need the protection, just in case. They may be a bit hot, and a bit bulky, but then so is a cast when you have your ankle in plaster for 3 months! :thumbdown:

Any 3/4 MX style boots froma reputable manufacturer should be fine (ATV style boots are exactly the same) which will allow you a high degree of ankle and shin protection, while at the same time allowing you to walk around and not look like a stormtrooper. I have walked for hours through markets and towns in my Discovery's, and I think they are very comfortable.

They are waterproof to boot - cold wet feet, yuck!!

My $0.02

Cheers,
Tricky