Thunderwear is by far the best method of concealment for me that I have yet found.\n\nWith my Ultra CDP, I can be sitting, standing, crouching, bowling, golfing, or whatever, and I often forget it's there. I do not believe that I would be able to do it with any larger of a gun, but frankly, I wouldn't want to.\n\nI highly recommend this holster. You might also want to consider a similiar product by www.smartcarry.com. My brother has the "white" version and he loves it. My next BTB holster will be one of those.