Velo Pronto-Z1 saddle Black/Gray D2 (Double Density)-patented saddle construction combines a lightweight resin with Krayton rubber inserts that flex to relieve pressure Webspring-Nine independent coil springs with thick padding strategically spaced for comfort and support in recreational riding O-Zone Center Cut-a simple cut out to relieve pressure CrN/Ti Alloy rails-special metal combination with weight similar to titanium, but with a more affordable price