ISM PN 3.0 SaddleISM proudly introduces the PN 3. 0. Starting from their Performance Narrow chassis, ISM used feedback from their professional athletes to make the next evolution in saddle design. With a slightly wider 120mm rear end and an updated shape, the PN 3. 0 is so comfortable, it will disappear underneath you. Similar to the other PN saddles, the PN 3. 0 offerings superb thigh and hamstring clearance. This allows for more rider body movement around the seat,