Lightweight, breathable and very warm, this jacket is a very comfortable layer. I primarily wear this jacket while running and I don't even notice I'm wearing it. There's plenty of room to layer underneath and it doesn't hold smells.
It doesn't have many bells and whistles other than a small pocket on the left arm. I thought it was a bit pricey to have such few features, but it's still a great jacket and does exactly what it says.
My favorite features are that it's lined with bamboo and the sleeve openings have elastic to say in place on my wrists.
These underwear are great. I primarily wear them for running. They don't ride up or bunch and they are very comfortable. Also, they provide nice support. I strongly suggest them.