I really rate these and have hammered them every weekend since I got them.

MerinoFusion Light 160 Short Sleeve -nGreat on warmer days for ski touring climbs, and cooler days for running. I really rate these and have hammered them every weekend since I got them. They are probably my favourite item so far. The only negative I could find is the fit. I reckon there's room for a slightly smaller size below the small I have. I find them just a tad loose with a slight tendency for the collar to pull back/sit too high at the front. Mostly this isn't an issue - for snow it’s preferable in my opinion to have the relaxed fit. However in thicker vegetation, particularly when moving at speed without the buffering assistance of a pack, I find they can tend to get hung-up occasionally.