The Cal. King ventilated Gel Memory Foam Mattress was purchased since my husband could not sleep on our old mattress. The mattress is great and my husband is sleeping again in our bed!! The only issue I had was the delivery, it was only packed in a very short box, and the mattress, which was clear wrapped, was just dropped on the driveway near our door. But once we got it in the house, laid it on the box springs, cut the wrap off, it immediately took shape, with no strong odors, and we love it!