It was delivered quickly after I ordered it. It says to let it fully expand 24-48 hours but it was totally expanded within 3 hours. There was a slight packing odor but that dissipated in 24 hours.
It has definitely increased my height of my bed and it is so comfortable. I have arthritis in my hips and the topper has made sleeping through the night possible. The reason why I gave it 4 stars is because it’s hot. Not exactly sure how the cooling technology comes into play. I’m sure it will be wonderful come winter in Michigan, I won’t want to get out of bed.