Black Nylon chinstrap with plastic bead. Ships free.
I got this chinstrap to add to my beautiful Tula Ava hat, which needs help staying in place in the wind. I will have to sew it in, as the Ava doesn't come with a strap but it came very quickly and I was happy not to have to pay shipping. Thanks, Tula! My hat has been admired and I have sent several hat shoppers your way!