For maximum comfort and freedom of movement, the Selle SMP F20 Carbon Saddle has our back. The F20 is constructed with ergonomics and performance in mind with a special foamed elastomer padding that keeps our sit bones securely situated without the extra bulk and a narrow seat to accommodate those of us with narrow to medium sit bones. Carbon rails and a carbon-loaded nylon body offer a stiff and responsive platform, so we can really throw down some watts on our next ride.