It's important to remember that these fabrics are designed to absorb sweat. But sweat can also start to break them down if it's not rinsed out. So while it's okay to wear a sports bra for a prolonged period of time, once you've worked up a sweat in them, it's time for the washing machine (or hand wash).
Can sports bras damage your breasts?
'Sports bras because there's more activity and motion, the breast is held together by fatty tissue and Cooper's ligaments, with all the stress of movement, it does stretch out, it doesn't go back. 'It can cause the breasts to sag and cause injury to the connective tissue of breast and cause pain.Jul 26, 2016