There are a lot of fusible tape products. Stay away from hem products. I would try https://www.amazon.com/Pellon-Steam-X40-Yards-Tape-White/dp/B00DV8XPEG/ref=sr_1_37?crid=XIMD2ZYY1VXL&keywords=heat+and+bond&qid=1640054132&rnid=2941120011&s=arts-crafts&sprefix=heat+and+bond%2Caps%2C136&sr=1-37

Use a pressing cloth and keep the iron as cool as you can. Try it first on your least favorite pair. Good luck!