I was actually looking for a bra to sleep in and this is almost perfect b/c you can barely feel it, yet it still provides me with a little bit of support.  I wear a D cup and even in the comfort of my own home and around my family, I know I need some support but don't want to wear a full support bra in the evening or in the morning when I am lounging.  This is just right.  I do have sensitive skin, and might prefer something made out of cotton, but this is still quite soft and not irritating.