Twin flex/Wing flex. This new technology allows the saddle shell to flex in key areas yielding a virtual custom fit without sacrificing critical shell rigidity and support necessary for optimal power transfer and comfort. Microtex is a waterproof, synthetic nylon microfiber material that is 20% lighter and more durable than leather. Features: Titanium/Al Rails, Twin Flex/Wing Flex padding, 199g (approx. weight). Team Cyclist is an authorized Fizik dealer and will honor all manufacturer warranties.