. >> reporter: carl and carey sherman know how to swim. >> i'm the captain. >> reporter: but even they know the importance of wearing a life jacket. >> they are not mandatory, even though we are swimmers, we still have to be safe. >> reporter: and those with children need to take special precautions. >> you want to make sure that you are choosing a life jacket for your kid that fits them at this time. you don't want one that they are going to grow into. that is one of the worst things that you can do. >> reporter: you also want to make sure it fits right. >> when you put it on the child, if you were to just pull up if it comes up around their ears, it's too big and find a different size for your child. >> reporter: another good tip, let them pick it out. >> fun styles and colorful with their favorite cartoon characters. >> reporter: they discuss the reality about the her 4-year-old daughter anna. >> i guess right, even if they can swim, she can keep herself above but that's about -- it's just for a little bit and it would be pretty hard to -- there would be a good chance we wouldn't ma