The sides are stretchy but made of an almost gauze-like material that is so thin my fingernail feels like it will go through it. The top was cushy but the fabric so stiff, crunchy and noisy it did not add any comfort to our memory foam mattress and I had to take it off the bed. Not a fan, wish I could return it.

Felt nice the first night or two. Afterwards just feels as flat as the mattress as if it’s not there.

While it feels nice, I sleep hot. It’s definitely not breathable and a little noisy.