Technical Construction, Thermal ComfortBuilding on their tried-and-true Warmer 100% polyester thermal fleece fabric, Castelli added their favourite tech details to make this jersey ready for regular use through autumn and into early winter. The cross-wrap wrist closures with the double-layer collar and zen zipper protector all add extra comfort, while the bonded fabric around the waist helps keep the pockets in place even when fully loaded. A full length zipper allows for maximum control of ventilation on milder or high intensity rides while 3 rear pockets allow for loading up ready for long mileage rides. Warmer FabricWarmer, more than just the name, it is exactly what this fabric delivers during workouts. It’s fleecy inside keeps you warm, while 100% polyester fibres quickly wick sweat away. It’s the fabric of choice when thermal insulation is equally as important as moisture management.