Lighyears better than the shrink kits.
When ordering keep in mind the strips are sent in pieces so don't think you're getting a long tall box.
Plastic is good and thick yet flexible that if it gets dinged it isn't going to rip.
Thumbs really hurt when pressing the top layer into second part. You gotta learn a system and I eventually used the butt end of a tool and that helped a lot. It will absolutely stay, so no worry of it ripping away like the cheap double stick tape does that comes with the shrink kits we all know and hate.
Good kits, friendly customer service.
This is the real deal...and living anywhere you want to keep the cold at bay these are a must for drafty or older windows.