Love that the top unzips! Our little pup had an accident in the middle of the night, and it was easy to unzip the top layer and throw it in the wash! That way, she can still use the bed, and we don't have to throw the whole bed in.  And she can still use it while the top is being washed! Zipper is pretty easy to use as well - no hassle/fuss with getting it back on.