When I first saw this I thought “what’s the big deal?”. It appears to just be a polyester zip-up cover. But my curiosity peaked when I saw it had over 35 Amazon positive reviews. Some even said it’s the “Best Seal for a Huge money Eating Hole in Your Ceiling”.
Home owners like it’s flexible to conforms to any crazy surface your attic may have. The zippered access makes easy entry and this sytem seals tightly, adequately sealing the attic from your conditioned space. Some users report a $20-$30 monthly energy savings.