yotache Open Cell Foam Air Conditioner Insulation Seal Tape 2 X 1 Inch, Non-Adhesive Air Conditioning Weather Strip, 6.5 Feet Long

Very dense foam and well priced and totally accurate description. I am using this foam behind the curtain rails to block light going up to the ceiling behind the curtains since the sun rises at 5am in the summer!!!! I will have to add double sided tape to it but it is still a great item, as described, just wish it came with tape.

This isn’t flimsy. It will definitely help fill any gaps in the window

Used thi to seal around and under my AC window unit. Long enough to go all around and a little, 1ft to put underneath AC to prevent vibration. Thought it was to wide, but was just right to seal all around and easy to install.

I used this at the top of my radiator and core support to eliminate engine heat being pulled from under the hood. Now only cool outside air goes through the front fins.

Great insulation, weatherproof and durable. Just started using for the second season around window air conditioners that get lots of rain and sun, and all of the foam is in perfect condition. Endlessly flexible and fairly stretchy for filling small gaps, corners, etc.