If you're talking about the one on the frame it's an X-lab aero bottle and mount. They're sold together. If you're referring to the mount on the aero bars between the arms, it's an X-lab Gorilla cage and I use zip ties to attach it to the aero bars. I used an X-lab torpedo mount before but one of the velcro straps broke and I didn't need to be able to take it on and off so couldn't see the point in using velcro straps. Zip are cheap and easy to take on and off anyway and the bottle cage is held in place more firmly anyway. And no, I'm not sponsored by X-lab. Not sponsored by anyone!