Sapira Hybrid- They say the smell should mostly dissipate after 24 hours and be completely gone within a few days. That is not the case. If your nose works properly you will be able to smell a beef-like smell for a long time. 
And the total weight is insane. You will need help to move this thing anywhere. I almost want to go back to the regular Leesa memory foam instead of the hybrid just due to weight alone. 
So back to the smell, more than 5 weeks in and I think it just finally went away completely. My partner and I both thought it smelled like meat, or jerky. Kind of hard to describe. It was bearable but I considered returning the mattress after 30 days. Waited just a little longer and it seems fine now. 3 stars because it weighs a million pounds and the smell lasts for 35 days.