Had an ADCO for our HTT for 7 seasons and other than a very tiny hole, fixed with a bit of duct tape, it went to it's new home looking brand new. We have a covered area right here at home, but still used the ADCO. When we moved to the TT, just never got around to getting a cover for this year, but will before next fall. Keeps it cleaner and protects against all sorts of stuff. If storing outdoors, wouldn't consider NOT having a cover for winter. Covering and uncovering every couple of weeks is a pain, but for long term, strongly suggest cover.