In reply to abr1966:
A good winter bag is a must in my opinion, and preferably synthetic if possible. When I went as part of a big group, a lot of stuff among the walkers got wet. Going through the tropic zone, it rained a lot and some of the tents leaked causing some uncomfortable nights sleep.
As for boots, I had a good quality boot that could stand up to anything a Scottish Winter could throw at me. I never made summit day as I was too Ill from the effects of altitude sickness. My mates said it was fekin cold and appreciated warm gloves, socks and down jackets, provided they were dry.
Post edited at 14:46