Ordered the mattress and bed from Wayfair. The mattress came 2 weeks before the bed itself therefore it did sit in the box until the bed arrived. When opening the box the directions on top stated to open within a day of getting the mattress (cant read instructions from inside the box) therefore I was extremely nervous. When unrolling the mattress and setting it up I prayed it would expand correctly. I let it sit for about 2-3 hours, it had no smell, and it surprisingly inflated rather quickly. I was able to sleep on it later that night and being diagnosed recently with degenerated disc disease I was purely amazed at how I felt this morning (aside from pains of putting together a bed). My older mattress was a soft top queen boxspring the whole 9. Super comfortable however with my back and neck issues I realize now how much more this mattress will help! And truly can not beat the price for a California king!