You know an IWB (Inside the Waist Band) holster is comfortable when you have random "OMG WHERE IS MY GUN?!" moments throughout the day while the gun is on you.
This is how I feel about my Athena IWB holster from Gun Goddess. I've had it for quite awhile (see previous review in Issue #10), and I have recently been carrying my Sig P938 on-body vs. in my handbag, mostly because the weather permits it, as I tend to wear roomier, bulkier clothing in the colder months. I always thought the Athena was comfortable, but over the past few months the leather has really softened up, making it so comfortable it is virtually "un-feelable" when I'm wearing it. The Athena is snug enough that I don't worry it will be jostled out if I run (but, let's face it—if you know me, you know I never run!). It is also very comfortable while I sit at my desk, or get in and out of my car.
An added bonus about the Athena is that it is customizable with a choice of five different leather colors, 26 different thread colors, and three different clip/cant options. The list of gun models it can be made for is extensive. It retails for $68 and is available on gungoddess.com.