Not sure what to wear for those long base rides throughout the winter? Castelli's Sorpasso Bib Tights boast Thermoflex and Termoflex Core2 fabrics for a balanced blend of insulation, breathability, and moisture-transfer—everything you want on cold rides. These lightweight fabrics ensure a wonderful fit and a full range of motion. Castelli's seamless, 4-way stretch Progetto X2 Air chamois offers support and comfort for your longest training ride. Plus, you get ankles zips for easy on/off, ankle grippers that help seal your shoe covers for more protection, and reflective details for visibility.