Lite HeatnBond Soft Stretch 20 inches wide by Therm O Web

I was a little skeptical that a fusible web could hold up on activewear, but this stuff really disappears into the fabric. It stretches right along with my yoga leggings without any stiffness or peeling after washing.

I used this on a knit hem that needed to stretch, and it held perfectly through a full day of wear. The bond is strong but the fabric still feels soft and moves naturally, no stiffness at all.

Finally, an iron-on adhesive that doesn't ruin stretchy knits. The bond held perfectly through my first wear and wash without any stiffness.