Castelli Tutto Nano ROS Long Sleeve Jersey Constructed entirely from Castelli’s fantastic Nano Flex 3G fabric, the Tutto Nano ROS Long Sleeve Jersey is a great option for cool autumn and spring rides, especially if there is the chance of a shower or two. The densely woven material provides greater protection from the wind than most thermal jerseys whilst still retaining excellent breathability, flexibility and warmth. Just like their renowned leg and arm warmers which use the Nano Flex 3G fabric, the jersey is super stretchy so it can be close-fitting and aerodynamic without restricting movement in any way. The nanotechnology water-repellent finish helps light showers and spray to bead up and roll off without penetrating the fabric, but more prolonged or heavier rain will require a more waterproof layer to be added over the top. Here, the sleek fit and good breathability help, allowing easy layering without overheating. Slim cuffs and a nice high collar help keep chill winds at bay whilst three rear pockets provide ample storage, and reflective areas on the shoulders and rear hem help raise visibility levels after dark.