I purchased this after returning a Puffy mattress. I was furious with Puffy’s customer service and false promises so I decided to go with a Casper. The Calder is much firmer than the Puffy mattress. It is also a lot heavier. I can tell they use better material for the base. However, it doesn’t have that same soft sink in feel like the puffy mattress. Overall, I still gave it 4 out of 5 stars because for the value and price, you’re paying almost half the cost for almost the same thing. I would definitely recommend this!