Never heard of this product so did a little search and found this post about it. Still not sure how it is really meant to be used, but sounds like it could be used to add loft in quilted designs with open areas between the stitching (like in a pillow or quilted bag panel). Hope this helps.
“ The felt is much like the puffy foam which is used for satin-stitched embroidery. Except, this felt washes away so that you don't have the stiffness of the puffy foam which remains under the embroidered design. With the wash away felt, you're left with a design which has soft raised areas.”
Thanks. That is what the info included with it says, but won't the stitches be too loose once the foam is washed away? Clear as mud to me!