Thanks for reaching out!
Depending on the length of the tear, we recommend using Gear Aid Tenacious Tape patches or Gear Aid Tenacious Tape repair tape. The patches work great if it is a small tear or puncture and the repair tape works great for tears where you need to customize the length and/or shape of the tape. It also comes in a few different colors if you'd like to try to match with your jacket, or it comes in a clear tape as well. The instructions that come with the tape walk you through all the steps to repair your jacket and keep it in service. Personally, I have a couple of jackets that have these patches on them and they have held up really well over the years.
Hopefully this helps, thanks!