I do love this bra! It is so very comfortable I could sleep in it. I am a 34D and bought size M. The straps and the band are a bit too loose even at the tightest hook. That is why, for me, I could sleep in this bra. Absolutely no constriction. However, that also means that the bra does not provide the best support for the day especially under tee-shirts. So, I use this bra mostly at home rather than continue the pandemic braless revolution. The straps at the back are wider that most bras so not ideal for wearing with tank tops. Despite the negative aspects, I still love wearing this bra. And the fabric is super soft.