We decided to collaborate with the fit experts at Castelli to create a long sleeve jersey that celebrates the holiday season. Featuring a collection of our favorite reminders of the most wonderful time of the year reindeer, poinsettia, a Christmas tree in the style of a vintage some might say ugly holiday sweater from yesteryear, the Castelli Holiday Sweater Jersey embraces the holiday spirit while providing all of the functionality of your favorite thermal jersey. The Holiday Sweater Jersey is constructed on a model very similar to Castelli's pro level Puro thermal jersey, so it won't feel anything like the itchy old Christmas sweaters you wore as a kid. Thermal fabric throughout resists icy gusts of wind and cold rain or snowflakes as you ride, while the fabric's interior provides a layer of insulating air next to the skin to keep you warm. The fabric also manages body temperature as you ride by continuously wicking moisture away from your skin, ensuring you aren't left with a damp chill after a hard set of intervals or your favorite regular climb. Though Castelli claims that the jersey provides ideal warmth for temperatures around 50 degrees, we'd pair it with a base layer and wear it on rides colder than that without concern. For finishing touches, Castelli adds an elastic gripper at the waist, three rear pockets, and an additional zippered pocket just in case you're inspired to take a candy cane or two along on your ride.