thanks for the comment! I actually got my model based off a chart I saw. At the time of purchase, I was 5'7" and 210lbs. But now, I'm 185lbs. It recommended this one for my weight and size. I also got the shorter center beam. I liked the adjustable lumbar this one has compared to the other models. I didn't like how the other ones came with both a Lumbar pillow and a headrest pillow. Lemme try to find the chart on my break.