A Comfort Core foam layer beneath the neat, durable Microtex cover is supported by light, strong, corrosion-resistant Kium rails. Light, strong, corrosion-resistant Kium rail. Comfort Core foam layer beneath the neat, durable Microtex cover provides comfort, and is enhanced by the full-length comfort channel which reduces pressure on the rider s sensitive soft tissue and ensures that all weight is correctly supported across the whole surface of the saddle.