Endura's Thermolite Pro Biblongs offer a great ergonomic fit for rides in cooler weather. They're made of Endura's Thermolite fabric that repels water and provides excellent warmth. Plus, an antibacterial 400-Series stretch chamois delivers ride-all-day comfort. The mesh upper bib prevents overheating while the double layered knee panels add durability. And, low bulk, wicking foot stirrups will keep your ankles comfortably covered even when you're pedaling hard.