So, I bought two of these tops after reading reviews. I was a bit worried that the wool would irritate my sensitive skin and it did not. I love these tops! I bought one in grey and one in black and also the bottoms as base layers for winter sports. I went rock climbing this weekend and it was a bit chilly so I figured I would try out the top! It helped maintain my body temperature the whole time! I hiked up hill with this shirt under a jacket. Before climbing I took off my jacket and wore a long sleeve cotton shirt over the wool top.