Very comfortable and concealing, can wear all day for modesty under a lightweight bra, and you can't even feel 'em. Wash with gentle soap at the end of the day, and a single pair will last for months. A great invention!

EDIT: Btw, I've never found any brand that works well for more than a few wears without a  lightweight, unlined bra (like the ones made by Barely There, the Breathe Bralette or the Microfiber Crop Top work well, if you don't need support and are just looking for coverage). No matter what brand, they tend to show more and fall off quicker if worn alone under a shirt. But with a comfortable lightweight bra, they're perfect, and last a very long time, like, six months of daily wear. And no worries about unintended "exposure."