a tree configuration for use in combination with an exercise or racing saddle . the tree is formed by injection molding with a thermoplastic material that results in a flexible , durable , symmetrical and smooth surface entity . the flexibility of the material prevents undue stressing of the tree at points where certain extended members are attached to the main body and , the members return to their original state after usage without maintaining a permanent spread or set . the smoothness and memory characteristic of the material result in minimal damage to the leather portion of the saddle .