Cold outside? No worries: the Castelli CX 2.0 Speedsuit has been developed in conjunction with sponsored pro teams, to be used in the cold conditions prevalent during the cyclocross season. Castelli uses Thermoflex fabric on the front for additional insulation, while also maintaining breathability. The short uses the Action 290 lycra fabric to keep the wind out. This item is highly versatile, and by adjusting your choice of base layers you can use it in various conditions.