I did not like this shirt, i wound up returning it.  I did not like it for two reasons, 1 These have a "slinky" feel to them, it felt like something i would wear to a club when I was 21 not something I would want to sleep in.  I have other products that use bamboo and they feel soft like cotton versus the way this feels.  2 I found the vneck cut too far down the chest (I do have a broader chest (42-44) than most)