The cover makes my Weber Q100 gas grill winterized - and it fits perfectly. The material is fixed, the seams are (in my product), unlike other reviewers write it stable. The material is solid and easy to clean with a damp cloth. Another practical feature is the possibility of size adjustable loop on which you can zuzurren the hood.
I did not compromise and wanted to buy the manufacturer's original, and indeed better than to save 5 and annoy me in the end. It was worth it - I would buy it again!