Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Does it cover just the top?  If so, how is it attached to the mattress?
Document: It's got a nice top to it, as far as having mattress top coverage......but for all it claims to do I accepted it to be a full over a zipp up cover for the mattress Iike other brands do to eliminate any allergens passing through and what not....unless you just want to use it as waterproof then its fine, but that's not what I bought this for.
Don't Make the Mistake I did....I bought this thinking it would cover the entire mattress. Unfortunately, it is nothing more than an expensive mattress pad. To protect yourself from allergens, dust mites, etc., a mattress protector should cover every inch of the mattress, top, bottom, and sides leaving no surface exposed. This thing does not do it.
The top and the sides are completely different material. Only top is all the stuff they are claiming. The sides are made from a porous material (you can see the small spaces between the weave of the sides). Only the top of the cover is as it says. Therefore, I do not believe that the sides are dust mite proof or waterproof, etc. If you spill something near the edge of the bed and it runs onto the sides, I believe it will go through to the mattress.
I guess I was in a hurry when I made the purchase of this cover. When the cover came in the mail, I was thinking what in the world have I ordered. This cover is the perfect solution to protect your mattress from almost anything. I washed the cover and it came out of the dryer just perfect. The cover is a terry cloth material on top. The underside is some type of material that will not allow anything to penetrate to your mattress.
It's thin, very soft and an extreme improvement on the standard plastic style that I've seen in the past. It's still going to be a little warmer than just plain sheets on a mattress, but nothing as terrible as a plastic cover. I think this is the best you're going to get as far as temperature goes and still protect your mattress.Sheets fit over the top without any problem- it's super thin and doesn't obstruct normal sheet use.
This seems to be holding up well through washings. I was disappointed a little with the fit. There isn't a real snug fit on my single size matriss. A little oversized. I feel the poor fit is important since it also is a waterproof cover-with the waterproof part just on the top surface. I usually don't have beverages in bed, but if there is a spill it might get to the sides of the matriss.
We like the cooling effect and that it does not make any noise. We put it on top of a memory foam type mattress which can feel warm but now we have no problems with heat.
Great quality & material breathable terry. Fits my pillow top mattress with ease! Have had a hard time finding  oversized to fit height of mattress.BRAVO!
Arrived on time. Exactly as described. Wanted a cotton topped, waterproof, without quilting, mattress protector to top our new latex mattress set. This protector is great.
Does not fit well on my king size luxe mattress with pillow top. It moves around and feels wrinkled all the time. Makes a slippery sound too. Do not know if it is waterproof or not and am no longer interested in finding out.
Answer: it acts as a mattress cover and i'll be honest, I don't like it. it slides all over and doesn't stay tight against the mattress.