I guess it depends on your build and the thickness of your skin (literally…hah). I’m 5’9" 175 and I can’t see it at all. You can’t even make it show itself like you can when it’s in your hand It settles in nicely between the bones (assuming you place it there correctly and it doesn’t migrate after). And the most you could have is a 2mm bulge (the diameter of the xNT). Probably wouldn’t be all that noticeable even if it did create a bulge.