I've been disappointed with the my icebreaker merino baselayers.. Full of holes after minimal wear.. They are as good as other baselayers I have, but significantly more expensive, so I wouldnt buy again. Whats the point of having a fresh smelling t-shirt if me, and all my other kit stinks? No point at all..
My favourite baselayer t-shirt is a Calvin Klein activewear one - TKMaxx - £8