I bake cookies a lot, especially around this time of year...but year round. I have been using parchment paper and/or just spraying the cookie sheet with Pam. I finally saw these on Overstock.com and bought them and I do not know how I ever baked without them! So easy! No more Pam! Just wipe them off with a damp cloth when done, dry with a paper towel...then I roll them back up and store them in a paper bag together to keep dust off of them. Great for roasting vegetables or french fries...anything you use a baking sheet for. Do not fear buying these if you are a first timer! I did and, as I said earlier, I do not know how I ever baked without them!