I have this in a 4" thickness on my bed. I can't keep my children off of my bed now. I bought the 3" for my brother and his wife, knowing they like soft but didn't want to go overboard with softness ( which is what I love), so they put this 3" on, slept the first night and said they are over the moon with how this changed their mattress. I probably could have gotten them the 4". I can attest to the 3" and 4" being "AWESOME"!!