Step 2: Create a stencil
So for the first step you need to either recreate this stencil by tracing the in- or outside of your sticky tape roll to a strip of paper... or pick another object to trace...
Once you have your stencil, trace it two times onto the neoprene (or you can use any other fabric you want to work with. Felt also works well. And cut things out.
Then trace the stencil one more time onto the foam and cut this piece out slightly (2-3 mm) smaller than the tracing.