What's the difference between Puff Stuff and Puff Foam? Is there a Canadian source?

Puff Stuff is water-soluble and provides a 3D effect to your design by dissolving away during washing.

Puff Foam is a rigid crafting foam that creates a 3D effect but remains intact in the finished design.

Embroidery Legacy sells Puff Stuff here & a Canadian source for Puff Foam is RB Digital.