These liners don't fully enclose with zippers, instead they fold over the foam pieces. Water sits on top of the material and literally wipes away. Because the material doesn't absorb water, it dries pretty fast. It's also not loud or crinkly.
It fits my Nugget including the triangle pieces.
My only concern is durability. I noticed a small tear or 2 along a corner seam so that makes me worry about how well this will hold up. I tried to fold more material over the small opening but I don't know if this will stay put from rough play so I'll occasionally check it.
Overall it'll protect the foam and at a great price point.