The vacuum packaging is amazing because the moment I cut it open, the topper started expanding. I threw it in the dryer for 20 minutes to fluff up more and it is very plush. I think I like the feel of a down topper better but this is nice. I don't think this is the full 4" but it still a decent amount and makes the bed comfy. Docked one star because the straps don't really stay on the corners of the bed and I wouldn't recommend this topper for the summer, not very breathable, I feel pretty warm when sleeping on it.