BXI Soundproofing Closed Cell Foam - 2 Pack Self-Adhesive 16'' X 12'' X 1.8'' Thickened Egg Crate Sound Proof Foam - Acoustic Foam Panels Great for Noise & Thermal Insulation (Black)

My room have a sliding door in my new apartment, and there was a huge gap which basically let through any sound coming from the kitchen. I bought this product and was skeptical that it could change anything, but oh my did it work! It now block sounds like if I had a real, sealed door. Cutting it was messy and it is by no means a clean finish, but it functions very well (I'll paint it white eventually).

I used these to soundproof my bedroom windows because I wasn't prepared for the near constant sounds of city living, and it cut down the noise of traffic and trains significantly. I only filled in my windows, so I can still hear some faint noise, but it's no longer unbearable. No more large trucks or train whistles waking me up throughout the night! Yay! Unforseen side affect is having trouble waking up from such a deep sleep and blacked out room, but I'd rather live with that than have one more restless night. The self-adhesive backing bonded well to the cardboard base I used to fill the windows, rather than stick them directly to the windows. This all fits nicely behind blinds, so its out of sight. I bought more to place between my TV's speakers and the entertainment center to reduce the echo in my tall-ceiling/open concept home, and quality of sound is improved! Definitely a good, thick material, great quality for the price, versatile use around the house, and the large size covers more area with less effort. Will purchase more for noisy A/C closet because it is listed as formaldehyde free, big plus! Highly recommend this product for its excellent performance!

Foam breaks apart, not a solid product at all. Would advise staying away

These actually work pretty well! we have a vent connected to the living room that isn’t connected to the ac or anything and it let so much noise pour in but this has helped a lot! it obviously doesn’t stop every noise but it has stopped smaller noises and muffled a lot! it sticks very well to the vent. I didn’t cut it because i didn’t want to but the material is very soft i imagine it wouldn’t be hard. Just sticks to whatever you want it to and you’re done!

I ordered black and my mom ordered white. We used them to soundproof the outside houses because the window ac flaps let everything through. They soundproof outdoor road noise and the ac noise very well. The only problem was my mom's were not white as listed, they were cream. I thought the photo listed was just a bad photo but that is the true color. These should instead be listed as cream so people don't get let down. The black look great. Id recommend these.