Medic Alert Bracelets

I bought Max this Medic Alert Bracelet because I think it is time he start wearing one. I got him something "cool" looking because I thought he would be more willing. No such thing. He keeps hiding it on me. I just found it again.

My husband doesn't see why he needs to wear one. He is safe enough at school and otherwise barely out of our sight. Even Max comes up with why he shouldn't have to wear it. The other day when I was asking him to wear it to the gym he argued that they didn't serve snacks there so he was safe without it. Besides he won't eat anything he isn't supposed to.

So does he need to wear it? And how do I get him in compliance?