I have done my due diligence on harness training, but I was specifically wondering if anyone uses a second harness? My cat is very strong and flexible so I was scared he might slip out of his harness, which is this one: https://www.amazon.com/dp/B0FQNFNDSD
He tolerates it well but I’m worried that it’s too easy to get out of.
I was wondering if a second harness that was more strappy could act as a failsafe and if anyone here has done that.


Addendum: after years of use, I have been very satisfied with the security of this harness: https://www.kittyholster.com/About-Us.html
The only downside is that because it’s basically a vest, it makes cats more prone to overheating on hot days (but on the flip side, it probably helps keep them warmer on cold days). Also you may need to occasionally clean accumulated fur out of the Velcro, but that’s easy enough to do.
Again, if very determined, cats will slip out of any harness, so acclimation to the harness is key.
I used one like this for initial training in the back yard. Cat still turned liquid and got out easily. I truly don’t think any harness is 100% with a cat.