Never put your bra in the dryer! If you're putting your bras in the washing machine make sure to put them in a washing bag. I get mine from Target and they're only a few dollars each. If you make sure to air dry your bras and store them where they wont get smashed, they will last longer and support you better.
You can use the gentle cycle, or I use a bra laundry bag, it has been a life saver. I got the tide one, it fits two bras at a time and I just toss it in the wash then the dryer, and all my bras come out perfectly fine! I use for every single bra!