Review (5/5): Very good wind noise blocker for cheap!
Fit very snug and easy to put on. I never felt like it was going to tear as others mention, but take your time and you should have no problems. There are two of them with their own plastic storage box so if you tear one you will have another and you can store them in the boxes provided. Also.... these go over the original frame for the Gopro cameras. It will work without the frame, but very loose. Best to use as intended with the frame on the camera.
(NOTE)...I did notice on my Gopro Hero7 Black that it made the camera heat up even faster than normal!
Regardless I would buy them again for such a cheap price for what they do! I am happy for now.