Stretch interfacingkit from gbsb Jennifer Taylor aka sewing revolution.
This kit  contains everythingy ou need to sew with stretch knitted fabrics. Some you might have used before and some new to us all.
Kit contains 8.5 mtrs in total  of;
Two types of fusable interfacing.
Fusable bias tape.
Fusable seam tape.
Fusable stretch fix tape.
And all the information you need to apply to your project.

Stretch interfacing kit