John L.wrote a review of Mountain Hardwear Mountain Tech Vest - Men's on December 20, 2012
Familiarity: I've used it several times
I'd like to start with sizing since I frequently end up between sizes on clothing. I'm 5'10" and 170lbs, I bought a large and it's plenty big. I like to layer and the large fits well enough to layer under a jacket or coat and it's big enough to wear over a sweatshirt jacket or hoody. If you want a snug fit like to wear while running you'd need to go with a medium. The fabric, stitching, and zippers are very good. It is lightweight and thin which is what I wanted. It adds warmth but if its very cold you'll need to layer, it's not going to perform like a down vest would.