The zero is flat saddle ideal for short distance road riding in an aggressive position this tri version has modifcations suited to triathlon riding a wider nose with more padding for forward positions and a more gradual change in shape front to back specfications size mm 254 x 136 weight g 215 base carbon fiber injection rails nack cover microfiber padding lightfoam technologies pas perineal area system this special cutaway technology eliminates pressure spikes and numbness