The sdg bel air 20 ti alloy rail saddle the bel air saddles are the modern classics providing ultimate comfort support and control the bel air 20 uses a resilient nylon base that allows extra flex on the edges through each pedal stroke and incorporates a base bridge for stiffness and ideal power transfer the bel air 20 uses the lightest eva foam available and is strategically designed with a rear rise which helps rotate the pelvis forward and can provide extra support for one who likes