The holes will disappear with washing. However, I would suggest investing in much smaller pins. Mine are about 1/2" long brass pins (brass doesn't rust, just in case one of my UFOs lands in the lap of a great-grandchild many decades from now). The pins are too old for me to remember the brand. I think I bought not the very smallest size, but the second to smallest. Years ago this was the size pin recommended in the quilting books I was reading. This size has been big enough for all of the battings I have used over the years, but I never did use a high-loft poly. Would think even that one would work, but not sure.