This is an excellent item if you are just looking for a mattress protector. However I purchased this due to the fact that we had bed bugs invade our home. The cover was an attempt to try to save our bed, and our sanity. However, this item does not seal. At the top it zips, then has a velcro closure. The spaces at the velcro juncture allowed for the bed bugs to escape. Ended up having to throw our the bed and the bed bag I just spent $$$ on, after only two weeks. I can verify the item does not close, since at the closure we found bugs coming in and out, along with their fecal material. Total waste of money when it comes to actually dealing with bed bugs.
We bought this because it is organic and we were done with plasticky vinyl pads that smell like PVC and sound like a box of rice crispies, complete with long nights of snap, crackle and pop. This in every regard is a winner, soft, quiet and totally odor free. We highly recommend this excellent product.
Cover was easy to slide on. I was worried the cover wouldn't breath and I would sweat but I haven't noticed a difference. I like that I can enjoy the softness of my mattress now without a thick pad in between. Haven't had anything test the waterproofing yet.