Winter's approach may lead some to head indoors to the refuge of the trainer, but you know that the freedom of riding a bike is best with wind in your face, even if that wind is rather cold. Castelli's long been at the head of cold weather gear, and the Prosecco Tech Long-Sleeve Base Layer keeps you warm and dry for winter training rides. Castelli uses a lighter weight Primaloft where bib straps overlay the base layer, ensuring even warmth across your torso as you complete that last set of intervals before second breakfast.