Light, warm and comfortable
I was hesitant to spend the money, but my running group said merino is worth it and they were not wrong. It does fit quite small. I always get a small and very comfortably fit a medium (snug shoulders, relaxed waist). It also pilled from my running vest after the first run but I suspect that’s more to do with the fact that it is wool, not synthetic. I love it. Would buy again in a different colour.