I was really impressed by how secure the harness looks as well! So many of them are not cat proof but this one seems well designed and comfortable. It's called a Freedom Harness and the brand name is GOOBY and there is a website on the packaging the harness came in. It's:
Gooby Fashion
I checked out the site and I think this harness might actually be for a dog but it fits him perfectly as none of the other cat harnesses we've tried were big enough for him.
My brother bought it in Arizona.