I have both the norona and harkila. The norrona is thinner and have warn it down to minus 2. I wear a fleece shirt (johnnorris special), tea cosy hat and some seal skin gloves. It's ok for when going up hill and get over hot, but sat in a corry out of the sun when spying or having your piece. it gets a bit Baltic, so I have a fleece in a ruck sack, a buff thingy round my neck and a neoprene balaclava. I also bought from a camping shop a foam seat too. To be fair, I do the same with the harkila, but prefere that when really cold and blowing a gale.