I purchased 2 of these in the hospital and then quickly realized that I would need more because of leakage and so I purchased 2 more from Amazon. I accidentally put the first two in the dryer - big mistake. Cold wash and hang dry I would recommend. They are comfortable but they ride up my back really high up.  It also might be that I need the next size up, though I am clearly in the medium range according to the Medela chart. Otherwise, they are cotton and comfortable.