Since I have received invaluable info on holsters here, I thought I would contribute something back.
I just received my Bearclaw Covert Assignment holster. This holster is an IWB Kydex and tuckable. I am using it for a Glock 19.
The holster is very thin, but without being flimsy. I cannot say enought about the quality of construction...excellent work, smooth edges, sight channel, and adjustable tension. You can order either low, mid, and high ride positioning. I went with the mid-ride and currently carry it in the 4 o'clock postion. I have also carried it some in the appendix postion and both locations are extremely comfortable for all day carry. The Glock just disappears and the tuckable option is superb. I also have a Highnoon tuckable in leather, but I am partial to Kydex.
The customer service prior to the order was outstanding. I spoke on the phone a couple of times prior to ordering and everything was explained in detail.
Not only did they meet my promised delivery date....they exceeded it by almost a week...less than two weeks for a custom made holster is hard to beat.
If you are a Kydex fan, I highly recommend Bearclaw.