The Ergon bar end grips are a fantastic way to add extra comfort to your flat bicycle handlebar.
You can find them on Amazon. Please consider using my affiliate links to check them. They come at no extra cost to you but they help me bring more content to you.
Products mentioned in this video in my order of preference:
GP5 - https://amzn.to/3nKktsf (this is the most comfortable grip by far, since it adds 2 extra hand positions)
GP4 - https://amzn.to/3nIRogJ
GP3 - https://amzn.to/37JUxHT
GP2 - https://amzn.to/3hfS1fp
GP1 - https://amzn.to/3mHLo6W