I’ve been caught out in the rain while camping in Bishop at the Buttermilks. Pad was soaked pretty good; I pulled all of the padding out and let it dry but it took a couple of days. I’d try to keep it dry as possible. Landing on a wet pad sucks also, not so soft, it’s kind of like starch water. You could get one of those construction trash bags to keep it dry. I’ve yet to do the Grand Canyon but from what I understand in the winter you never get direct sunlight, so no drying it out in the sun.