I think I found the best way to cut vinyl wall padding (adhesive back style)

Been experimenting with some scrap adhesive panels while I continue to trim out my space.

Ive found a solid method for getting perfect cuts that I think is universal for adhesive style padding commonly found on Amazon.

Score a straight line with a utility knife against a square on the vinyl side, just deep enough to cut the vinyl only. Then use cutting shears to follow that line and cut the foam. The foam cut lines won’t be perfect but the vinyl cut will be and you can clean up as needed.