I have purchased several similar items like this one in the past, that were supposed to help keep cold air out & warm air in, but they never worked well at all. This item actually does exactly what it's supposed to do! I haven't had any issues with feeling cold drafts coming in under the door, or any warm air escaping - I'm quite happy with it & definitely recommend! It's very easy to install - you just cut it to the proper length, peel off the backing & it sticks to the door with an adhesive strip, which holds very well, but also isn't difficult to remove!