Designed with input from professional cyclists who compete in the Tour de France, the Prologo Nago R4 saddle is designed for optimal performance. It offers good freedom of movement and pedalling efficiency in all positions with its 245 mm length, T-shape and advanced anatomical centre. This saddle has a narrow width of 147 mm to suit cyclists with a narrower ischial bone width. The semi-round ergonomic shape is ideal for cyclists with average pelvic rotation flexibility. The Prologo Nago R4 PAS TiroX 147mm is also comfortable with its latest generation variable density foams, which provide good support during all phases of pedalling. Prologo's PAS system features a large central channel with holes to eliminate all pressure points during exertion. The shell is made of long-fibre carbon, a lightweight and rigid material. The steel TiroX rails offer an excellent balance between weight and strength while providing better vibration absorption.Technical specifications: Colour: Black Size: 245x147mm- Weight: 209 grams - Long fibre carbon shell - Tirox rails - Variable density foam - PAS system with a wide central channel