In the summertime especially when I wear a lot of flip flops my heels will get really dry and they will actually get these little cracks on them. Some of the cracks must be kind of deep because sometimes they hurt. I don't want to give up wearing my flip flops as I live in a really hot climate (Glendale, AZ) and they are so easy to put on/take off. Does anyone have any advice on lotions or whatever that will work to help with this? Thank you.