The thermal jersey is the first step into cool weather clothing, where Castelli has set the standard for what clothing can do. You'll wear this jersey on cool days, so it has a brushed fleece backing but kept the fabric stretchy for a great fit. Since you're using it in conditions that aren't cold enough for a jacket, the fabric is engineered to let some air in so you don't overheat. We think a jersey like this should be pure function, so you've got three spacious rear pockets, silicone gripper elastic, and easy-sliding YKK® Vislon® zipper.
Warmer fabric on body and sleeves
Warmer X-Stretch side panels
Gripper elastic at waist
3 rear pockets
Easy-sliding YKK® Vislon® zipper with neck protector