I got silicone bracelets made, forget where though. The company I used had a large selection and I let my son pick 5, we had 2 other children with us that were not ours but wore the bracelets and then I had a 2 extra if they got lost. My son loved them and wore them constantly from the time they came, last Aug, until months after our trip. I also get him to wear them when we go to the local attractions, just in case. He's 5 now and still loves to wear them, sometimes to match clothes on a school day. I put our last name and my husband's and my cell phone numbers. Then pointed out CM in the world and told our son if he could not find us to find one of them and have them call the numbers on the bracelet. Because they were a two color blend, you had to look close to see the info, which kept me from worrying about someone looking at them and seeing it from a distance. I think the 5 of them cost around $20 with shipping.