All this talk of travel capsules etc, I am learning about the needfor layering. I will go hunting for camis or thermals etc everyone is talking of now i am learning a coton long sleeve t and a jacket are why I get cold. I amdoing Canada and uk during trip and temps will range from 0 (hopefully not too much) to abou 20 celcius with most of he trip around 10. Do I look for those fine merino layers at the gear shop? Synthetics? Or silk I think i have read about. Do i get camis or sleeved.