I received this Serta Simons Beautyrest BR800 Firm mattress through follow-up calls and well-protected qualified personnel at the time of delivery in times of covid-19. I have problems with my back due to a fall and I had not been able to get a suitable mattress but when I received this Beautyrest BR800 Firm I hesitated a bit because I touched it and it felt soft but I was wrong ... it has a comfortable and safe firmness and I could have A night as relaxed as a baby, nothing hurt and I felt like new. This mattress is very cool and provides flexible support but at the same time feels firm and comfortable when you place your body on it. Thanks to Beautyrest I have found the solution for a relaxing break ... if you have a lumbar problem this BR800 Firm mattress is the perfect solution .... I am so satisfied that I have nothing more to say .... thank you for this blessing. ..I recommend it 100% with guarantee ..