I use to be anti running belt because they were heavy, they moved. But not this one. I’m addicted to this running belt.
I wore my SPIbelt while riding my bike and it didn't even feel like I had anything around my waist. It was super comfy and stayed put.
The SPIbelt is completely unnoticeable when worn, and it holds a phone plus whatever else is needed (keys, etc.). This finally got me to run with a phone like a non-caveman. Highly recommended!