Warmer, brighter Castelli's team have been working on the third generation of the Puro Jersey, their most popular winter jersey, to make it better than ever. They updated the fabric to make it warmer than last year, especially on the sleeves, and added reflective panels front and back for day and night visibility. Otherwise it's a no-nonsense technical piece aimed at comfort and warmth while making you look good. Features Warmer fabric on body and sleeves. Reflective panels on front and back. Gripper elastic at waist. 3 rear pockets. Easy-sliding YKK Vislon zip. Technologies YKK Zipper The right balance between elegance and color, strength and endurance. YKK Nylon coil zip fit the most difficult fabrics and delicate applications in footwear and sportswear. Warmer Fabric Warmer, more than just the name, it is exactly what this fabric delivers during workouts. It’s fleecy inside keeps you warm, while 100% polyester fibers quickly wick sweat away. It’s the fabric of choice when thermal insulation is equally as important as moisture management.