Must have been about 7 months ago I gave this some serious thought. I've always noticed it is quite difficult to get into pulling position with my 4 inch belt. Noticed I wore my belt pretty high, decided to lower it, got worse. Gave my best effort to measure the distance between lowest rib and my hip bone. Its about 3 inches. I am very long torso'd. The 2.5 inch belt has been an improvement. Took an initial adjustment for me though.