so I love the design, quick delivery, and adjustable system. unfortunately as a previous poster wrote they do not adjust tightly to my head (note I have a size 7 7/8 hat size, so I got a big NOGGIN!)
as I am using it to hold my dental loupes, I need it tight against my head to make sure I can see clearly, which unfortunately is not possible. good product, but please make a smaller size CHUMS!