This quarter zip base layer is very well made and the mid weight is perfect for layering. The material has some "slip" so it isn't as difficult to wear with more grabby fabrics. I walked this morning in 22 degree weather wearing it under a lightweight fleece and packable quilted jacket and didn't feel the cold at all. Normally I would be between a small and a medium but I chose the medium and it fits perfectly. The longer length is nice as well.