I used short pieces of foam pipe insulation. It's a lot like the pool noodles but it's hollow and slit lengthwise so it can be slipped over a pipe. Costs about a buck for a six foot length at Home Depot. Based on experience with our old cover, I put it over all the sharp corners (the places the old cover wore thru
)and it took two six foot lengths. Seems to be working fine so far...no holes yet.