Endura's Thermolite Pro Biblongs are perfect for rides in cooler weather. They're made of Endura's Thermolite fabric that repels water and provides excellent warmth. The 600-Series antibacterial Silver Dry multi-density stretch chamois delivers ride-all-day comfort. Endura included a convenient zipper fly on the mesh upper bib along with double layered knee panels, for added usability and durability. Take advantage of the zippered ankles for easy on/off, as well as reflective logos for enhanced visibility.