I make a lot of horse “stuff” out of polar fleece, and I always bring the material home and run it through a rinse cycle on the washer, but then I do pop it in the drying to dry it. And I do dry it with a dryer sheet to help control the static. I do this before I put the material on the shelved, ready to be used. One of the advantages of polar fleece is that it can be machine washed & dried, making it an easy to care for liner or cooler. Compared to the traditional wool liners and coolers, it seems to wick water as well as wool, but without the shrinkage & itching that come with wool. I’ve never had polar fleece react negatively to being dried in a dryer, with the exception of the static issue, which the dryer sheets pretty much take care of.