Hi Tom,
We’re very sorry to hear this. A belt loop should certainly not come loose after just one use, and we completely understand your disappointment.
This is not the level of quality we aim to deliver, and we appreciate you bringing it to our attention. Please reach out to us at customer@amundsensports.com with your order details and a photo of the issue, and we’ll be happy to look into this for you.
Thank you for your feedback, and we sincerely apologize for the inconvenience.