Trail Saddles are specifically designed for pleasure riding. Comfort is the main goal. Hours in the saddle over uneven terrain can make you quite appreciative of a saddle that's designed to lessen the wear on your body.
Since you won't be doing heavy work on your pleasure rides, this saddle is much lighter weight than working saddles such as roping or ranch style saddles. Because trail saddles are so popular and the choice of so many riders, they come in more styles than any other western saddle type. Typical features of a trail saddle include:
Most riders simply ride for pleasure and don’t require heavy working saddles. Because of their popularity, the trail/pleasure saddle type is also where you'll most often see new materials (i.e. synthetics) and new concepts (i.e. treeless saddles) first appear and gain traction.