I ordered a size up for a loose fit which turned out to be a wise decision! It would be too small if I got my normal size XS. This jacket is windproof in the front while the back layer is more breathable. So you won’t be too sweaty while wearing it in contact with your skin. From my experience by far, it also works pretty well together with a thermal layer.

Seems like a great jacket, but it definitely runs small. I ordered my usual Small, then had to return it for a Medium, and now a Large. Even with a Large, the arms are very snug on me. Nevertheless, I think it will be a great jacket with the mesh in the back since I wear this type of jacket year round in San Diego.