This serves my husband perfectly for what he wanted in a lightweight vest.  Typically, he wears a vest like this over a thermal or long sleeve shirt.  It is longer than other vests which he really likes so that it doesn't hike up.  It folds up nicely and does a pretty good job keep the cool wind out.

It is perfect for those golf days that require layering of clothes and protection from cool wind.  The fact that it folds up so small is a real plus for storing in the golf bag.  The medium looks true to size.  Seams are straight and looks to be well-made. He says it's super comfortable and perfect for him.  Yay!