This is a mattress protector, not really a mattress "pad" (the word "pad" suggests this adds padding--instead it is an open-sided mattress protector, with a terry cloth surface on the top side). The package clearly labels this as a mattress protector, so I was a bit annoyed it is described as a "pad" on the website. As a mattress protector, it does not zip to cover the entire mattress. I decided to use it, but still require a full zip mattress protector in addition to this one.