ISM PN 3.1 SaddleISM proudly introduces the PN 3. 1. Starting from our PN 3. 0 chassis, we added more padding for riders who prefer a slightly softer ride. With a 120mm rear end and and tapered edges, the PN 3. 1 is so comfortable, it will disappear underneath you. Similar to the other PN saddles, the PN 3. 1 offerings superb thigh and hamstring clearance. This allows for more rider body movement around the seat, and is great for diving into fast corners. Like all ISM