This winter the Craft Sport Core Beat Thermal Midlayer has been one of my favorite midlayers for on and off the mountain. It is made from 100% polyester but feels like a multi-textured garment because of the baffled like underlayer. It feels warm, high quality and durable and all for only $65 USD. As soon as you touch the material it feels like a more expensive article of clothing. I would recomend it for winter athletics as a midlayer or as a light jacket for spring or fall days.
I am 5’10” about 170 lbs and wear a size large. The large gives me enough room for a tighter layer under and enough unrestricted movement with a coat or shell over the top.
If you are looking for a mid-layer that is versitile, high value, as well as looks and feels super high quality be sure to Check out the Craft Core Beat Midlayer.