This is absolutely the best lower back support foam that I ever had! I have a Herman Miller chair in the office, but due to long-time sitting and maybe disappropriate sitting posture, I am gradually having mild sciatic pain. That is sad and making a lot of discomforts. I have a similar Samsonite foam for my car seat, but it can�t beat the firmness and the strong support of this product at all! I used this foam for almost a week, together with Herman Miller chair, and now feel sciatic nerve is st...