We needed a sound barrier in our sunroom. We have Eze-Breeze windows in our sunroom and we did not want to hear our next-door neighbors when they are in their yard. We did not expect the Indow inserts to block sounds completely. We were happily surprised when we received them. Even with just vinyl windows from ceiling to floor, you cannot hear any sound in the sunroom now! They were very easy to order. The Indow team is extremely helpful and customer oriented. The inserts are also easy to install. It is one of the best investments we made. We noticed that the inserts help with insulation as well, although we have them only on one of the three walls that have the Eze-Breeze windows. If your neighbors are a bit noisy, don't exhitate to buy the inserts. It is money very well spent!