Good job Razer. The get compliments on their looks. The user manual recommends one from Trusted Chargers, but its only available in white. Definitely good price and product and highly recommend. I thought I would try this holder because it has rubber bands that can fit multiple sizes. Seriously though he says they?re very comfy, fit well and keep his feet warm. Happy to change my review if I can find out how to stop the warnings but so far all I can find is "charge them". So Im alternating between them and my old Reeboks until either the shoes or my ankles adapt. This one is far superior. And last but not least - they look gorgeous.