Very compact and lightweight
Mesh back is also hi viz.
Good price

Seems delicate.
Probably will need to go up one size.

I had been looking for a very compact lightweight wind/rain vest to keep in my jersey pocket or saddle bag just in case. I required a mesh back to help control sweat. I got this on sale for $35. I take a medium jersey in Castelli and Capo, which fit me snugly. I got the large in this vest and it fits perfectly. It's a bit short in the front when standing erect but perfect on the bike. It's very lightweight and compact weighing 72 gm on my scale. I got the hi viz yellow and like that the back mesh is also hi viz. It comes with a little circular storage pouch for it, has no pockets, and has a two way zipper which is a nice feature. It is very lightweight and seems a bit delicate so go easy on it and the zipper. It works great in the dry but I have not ridden with it in the rain and I suspect it would offer very minimal protection.