In reply to Spike:
> We did this a few years ago (maybe 18 yrs) in normal leather b1 boots and the most basic crampons. No fancy jackets, just layers and a goretex shell ....
We did it even longer ago (I just worked it out .... 25 years!), in old school plastic boots. I'd think the Nepal Extremes would be fine. Like Spike says, layers and goretex. We carried duvet jackets & big mitts on the day just in case, but certainly didn't need them.
Making sure you're acclimatised properly is key. I recall some scree and straightforward snow plodding, with one crevasse with a ladder over it. The summit view is quite something. Have a good trip.