I am looking for suggestions on the best kind of period underwear for heavy flow that I can wear during running. I prefer to wear boy shorts style underwear. I know there are several brands out there but I'm wondering if you've tried them and what is suggested. I am in my forties. I am overweight and my flow is heavy so I don't want to leak while I am running and doing cross fit. I am wondering if the material is soft, comfortable, seamless, and breathable.