Versatile, fits perfectly. - Patagonia Nano-Air Light Hybrid Jacket - Men's

This is a very handy jacket - good for travelling and layering, great at regulating temperature. I wore as a midlayer skiing in January @ Winter Park CO. As the jacket claims, I felt the breathability was top notch, especially on the back (wore with and without a pack) I was comfortable without overheating/ getting too cold.