2010 Harley-Davidson FLSTFB - Softail Fat Boy Lo, 2010 Harley-Davidson® Softail® Fat Boy® The 2010 Harley-Davidson® Fat Boy® model keeps that heritage alive more than forty years later. And this special edition shows a darker side of the original "fat custom" bike - laid-back and blacked-out with an unmistakable profile on the road.