cant find any info on the width of their bags.am looking at the classic 800 which i have found for £109.00.am also confused about the temp rating.the website gives 2 comfort ratings, en comfort -3 and en comfort limit -10.which one should i be looking at.will want to use this for winter on campsite and mountain use in a tent.thanks for any advice.its either that bag or the new skyehigh bag from alpkit,when they get here.

The sleeping bag pdf on this page is essential reading. It explains the whole thing in minute detail.

http://www.mammut.ch/mammut/downloads.asp?sid=2

I would take that as a bag suitable for use -3 to -10.  add another 5 or six degrees either side of that temp and you will be getting too hot or cold in my experience.

I have a ME helium 800.  It is too warm when it is above freezing and it is en -6 comfort, en comfort limit -13, en risk extreme -32.

Earlier this month I used the bag and it was cold at night but I had to sleep with it udone and half out the bag. 

I sometimes wish I had bought a 600 bag rather than the 800...