Prologo Scratch Pro X14 Saddle with Tiro X Rails: Prologo Scratch Pro X14 Saddle with Tiro X Rails. This saddle is a round saddle so suited to long mountain bike rides, the Tiro X rails add a great combination of strength & light weight support. Tiro X Rail Rail light-alloy steel, this material is highly resistant to traction, & torsion for its light weight its for these reasons it is used in used in the aviation & aerospace industry. Tiro X then turns out to be a rail with a good balance between weight & strength, that doesnt fear the normal stress that addresses a bicycle. ESD Ergo Shape Design is where Prologo have trimmed the saddle at the sides meaning more space for the legs of the cyclist, this translates into a better pedal stroke & the rider staying in the correct position. Active Density Multiple padding zones along the saddle. High density at the rear, medium in the middle & low at the front, this gives the maximum level of comfort where its needed & eliminates pressure during pedal strokes. Side Protection System The Smart solution to protect the sides of the saddle. It protects the saddle when the bike is leant against a wall or a tree, avoiding scratches on the cover. Slide Control A Prologo patented system that allows the rider to keep the correct position by avoiding sliding forward. U Clip compatible Tiro X Rails Active Density Padding Ergo Shape Design Side Protection System