tommyj27 wrote:
I'm thinking that if I have fire coming through my leathers I have bigger problems than a scar

It is not only the flame type heat you have to worry about !!!
From personal experience many, many years ago I had a riding suit that had the latest OMG lining. very warm for winter riding.
The day before Christmas at -2 ambient I hit black ice and got dragged by the bike few yards well.
Having extracated my self from the bike, I tried to stand only to find this sythetic material lining had welded itself together and worse still to the synthetic components of my normal dress wear. I arrived at my destination in rags and a few minor heat induced spots on my side and back.
Looking back I was lucky I was not travelling beyond the speed limit & sensible riding envelope dictated by the conditions.
I have tried quite a few base layer bits and pieces over the years both on bikes & in the military. Helle Henson became the in thing to wear a few years ago for cold conditions for military types. It kept me too warm and and became very nasty very quickly as the inner surface pile became sodden with sweat. Even though it was a green colour you could not remove your outer clothing as it stood out too much against the surrounding forest & snow.
I still see it advertised as being "wickable " hmm their idea of getting sweat off your skin is different to mine.
As to the Bamboo stuff I tried the top only today, the ambient temperature is quiet warm. My upper body & arms (has long sleeves in this top )are cool and dry and my anti-persperant has worked but the pants are their usual nasty selves after 3 hours of riding.
Which as a side by side test proves the Bamboo top works well !!!!!
Thanks TK for the heads up, tomorrow I am off to Twickenham (home of English Rugby about 5 mins ride from here ) to buy the "Under Armour" heat kit and I will give that a try too as the cost is quite reasonable at 40 UKP a suit (t top & long johns )
They do have the advantage it seems of being "compression " fitted ie tight to stop the probability of Deep vein Thrombosis caused by fatty tissue releasing a blood clot after a sustained rest period (sitting on a bike for hours) and then suddenly elevating your blood pressure. It is the same principle as long haul flight socks.
Will keep you all informed as I go