Hi! It is me again. I have the braclet from the 50fifty sight they are water proof  wrist bands and they are very stretchy. They do come with a waterproof paper to fill out and stick into the medic sign. I have also taken as a special precaution as to spray it with a shoe waterproofing spay. lol so far no problems. I do have a pool so we do alot of swimming .You cand also buy extra paper 30 for like 3.00dollars. Like I said with a very active 10 yr old I have lost several braclets from medic alert and I do recomend everyone have one of those my sons says salt losing congenital adrenal hyperplasia on cortef and florinef. But at school he has lost one in gym no one ever found it ,it was an outside gym class and he lost one on the playground. It actually somehow got caught on the fence and he tore away from it and it went flying on the other side of the fence. I never found it when we went looking for it .He has also lost two at home. Well I have 4 kids and I cant keep paying out that kind of money, so when he is at home with us or in a baseball game or basketball game he uses the other braclets.They are used only when someone that is with him knows exactly what is wrong with him (and if you are like me your cah child is not far from your eyesight enless they are in school.)Also I just wanted to let you guys know that where there is a will there is a way I have also taken his medical alert and sewn it onto a velcrove watch band cause he kept losing and braking the braclet that has worked well except after swimming and bathing with it on it deteriorates so that is why I have gotten the other braclets. and the one sight is like a medical alert but all the info is on the internet .http://www.emstags.com/EmsTags/products/utilitykit.htm Hopes this helps someone take care Jamey