[ceilismom]

I just bought some bamboo ones from homemademama on HC. In fact they're sitting on my desk waiting to be prewashed right now. Under a sport bra, they don't show at all, don't know about other kinds. These are contoured.

I also just got some wool ones from Covered Caboose on HC. They aren't contoured, but you can order pretty much any diameter you need from her. They show just a little more under a sport bra (slightly thicker pad).