These were a ton of fun and I am really happy about how they came out. I think you should try these. This would be a great gift.
https://www.amazon.com/Insul-Bright-Insulated-Lining-36-Inches/dp/B07Q6N4JYT/ref=sr_1_1?dchild=1&keywords=insulated+batting&qid=1608367751&s=hi&sr=1-1
https://youtu.be/PLOEdGXgYQs
https://youtu.be/teQEmNZsZUo
https://youtu.be/KfQ1ap8iw8A