I bought this mattress after doing allot of research and reading as many reviews as I could find. This is a very firm and very good fitting mattress for our crib. We have a memory foam mattress we also bought from OS for our bed and love it. Our little girl now 6 months was used to sleeping in our bed and would not sleep on anything else very long. The mattress our crib came with was nothing like our Memory foam Mattress she was used to. The mattress the crib came with also didn't fit into the corners very tight and was unsupportive. We are more than happy with our purchase and feel its the best value and a safe choice. Our Little girl loves her new mattress!!!