It's not silicon but the _best_ (charging only) cables I've used by far are the Anker Nano [0] cables. they are so flexible, feel amazing, and I wish I could replace all my cables with them (but can't due to cost). It's USB 2.0 speeds so I only use them for charging but that's one of the reasons they can be so flexible/enjoyable to use (they don't have to be as thick to support USB 3+/TB speeds). I own many other Anker braided cables and none of them are like this one.

[0] https://www.amazon.com/dp/B0CZ43567W