It looks like naugahyde. The texture is going to make it near impossible to mend. You are better off recovering the entire seat.

Visit /r/autodetailing and search for car seat and steering wheel repairs. There is a guy who has posted like 10 of them and he walks through his products and process

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You seat is pretty much shot.

You cannot repair it to look good. The best you can do is get a heavy cloth patch of a similar color, cut the patch so that it is larger than the torn area and insert the patch into the hole. Apply flexible fabric glue to the patch where it is under the seat coving, place a sheet of wax paper and then a weight on the patch for several hours.

It will look like an obvious patch, but it probably is better than the open hole

Great. Will do. Thank you.

Ok. Thank you. I’m guessing a repair is in order any way to stop it getting worse?

That is correct.