I have never tried to carry my G20 or G21 in a IWB holster, but I suspect it would defiantly print some during summer months carrying. I do however, conceal carry my G29 and G30 in a kydex IWB holster all year around with no problems at all (doesn't print that much even during the summer time cover t-shirts (even with Pearce +0 pinky finger mag floor plates installed) and is fairly comfortable to wear for long periods of time). Both the G29 and the G30 are two of my most favorite conceal carry pistols I own. I forgot to mention, I am 5'10" and around 180 pounds.