I recently picked up a selection of Icebreaker 150 fine Merino baselayers and have been amazed at the comfort and warmth these thin and light natural layers provide. If you find the morning sessions a little crisp, but still want the freedom to move without wearing bulky top layers definitely give them a try! The staff at the Birkenhead Point Icebreaker outlet were very helpful and well informed on the product range. They also had a huge range of styles and sizes and it pays to try them on as the sizing is a little different. I normally wear a medium but the small was perfect for me.