The Solace is a new shirt for icebreaker, and it seems like they were going for something a bit more casual and for spring, winter, and fall use here. The fabric feels a bit heavier than the Sphere or Techlite, which I love to wear for runs and hikes year round. I love the feel of the tencel blended with the merino as it makes Solace feel so soft and doesn't have the initial prewash itch that some merino products have. Although not my first choice for wearing in the heat, this shirt will be a great casual and under baselayer shirt in the cooler months. THe fit seems a bit larger than what I am used to with icebreaker, typically I wear a medium but could definately have sized down to a small in this one!