From crisp autumn mornings to breezy spring afternoons, the Castelli Men's Sorpasso 2 Bib Knicker provides essential insulation to keep you riding comfortably through chilly transitional seasons. Castelli recommends it for temperatures ranging from 50 to 60 degrees, making it ideal for transitional seasons when it's not cold enough for thermal winter apparel, yet it's much too chilly for standard cycling shorts. ThermoFlex Core2 is placed along the front panels and knees for extra insulation from heat-robbing breezes and cool temperatures that would otherwise leave you shivering. To promote flexibility, Thermoflex over the thighs and rear legs for fluid pedaling motion. Castelli then employs a multi-density Progetto X2 Air seat pad to soak up jarring oscillations that would otherwise cause fatigue and chafing. This premium seat pad is lined with four-way stretch, seamless fabric that conforms to your every move without creating irritation issues.