I have not tested the pad for how waterproof it is.Mostly I need it to be water resistent. However, the fabric is a smooth weave and not slippery and the cover is padded. I am satisfied with it.
I've had this topper for a week now. For me, the smell wasn't too bad. The difference in comfort is amazing. Purchased this after reading many reviews . So glad I bought this. I feel like I'm sleeping in a new plush mattress . Would highly recommend it to anyone sleeping on a hard mattress ..and it beats buying an expensive mattress too :-)