Prism99

Molefoam is a little thicker than moleskin, but both work. I cut it with my rotary cutter into narrow strips and then use it to create a 1/4” seam guide on the bed of my sewing machine. With moleskin, I usually layer one on top of the other to make the guide a little taller. With molefoam a single layer is enough. Both have adhesive on the back with a peelable paper backing, so they stick well. These are temporary guides so easy to remove and replace with a new one.

edit: do not use on vintage machines such as old Singers, as adhesive can damage the finish on those machines.