My 4 year old son and I battled Swimmer's Itch last year on our vacation at Crystal Lake in Michigan. Both of us could not sleep at night due to the itching. We emptied multiple tubes of cortisone cream. This year we used SWIMMER'S ITCH GUARD. We had NO swimmer's itch! NONE! We slept at night! We had FUN on Vacation! THANK YOU for giving us back the lake!